3 letters:
aer, air, ere, err, mer

4 letters:
ayre, baer, bahr, bair, bare, bear, behr, care, cher, dare, darr, derr, eyre, fair, fare, fehr, gair, gare, gehr, hare, hehr, heir, herr, kehr, lair, lare, lehr, mair, mare, mehr, nair, pair, pare, pear, rare, sare, sehr, serr, tear, ware, wear, wehr, zehr

5 letters:
-ware, abair, abear, acair, acere, adair, adare, afair, agrar, alair, apair, aware, baehr, blair, blare, caire, chair, chare, cheir, chere, cherr, clair, clare, daire, derre, enare, ezair, faire, ferre, feyre, flair, flare, frere, freyr, glair, glare, haire, hairr, herre, hwair, icare, iqair, j-air, kahre, klare, knerr, laire, lehre, maire, ne'er, nerre, ohair, ohare, opere, oware, paire, perre, phair, phare, phear, plair, reher, sayre, scare, serre, shair, share, sherr, skare, smeir, snare, spare, stair, stare, stehr, sterr, sware, swear, taire, terre, their, there, traer, usair, usare, utair, uzair, vdare, verre, weare, werre, where, wrair, zeher

6 letters:
abwehr, actuar, adaire, addair, adware, affair, aflare, aglare, aldair, altair, appair, ashare, atraer, belair, belare, beware, blaire, bonair, bucare, cemair, chaire, chehre, cierre, claire, comair, comare, conair, cycare, decare, dehair, delair, denair, dreher, eclair, empair, enaire, encare, essere, fanfar, filare, fraire, freyre, glaire, gleyre, guerre, hilare, hs4air, impair, indear, infare, jacare, januar, javier, jonair, kierre, kreher, laware, lierre, luxair, manuer, mayair, mcnair, midair, mifare, mohair, navair, novair, o'hair, o'hare, on-air, operar, optare, ornare, ovaire, pierre, pkware, plaire, polare, praire, prayer, redear, repair, safair, samare, schehr, scherr, sierre, solair, solere, sorare, sperre, spyair, square, stderr, sterre, tacair, theyre, traire, tulare, unbear, unfair, unhair, unsere, unware, upbear, uptear, vmware, winair, yacare, zuhair

7 letters:
a-share, adorare, affaire, agitare, airfare, allaire, antbear, astaire, auclair, austeyr, auxerre, aviaire, b-share, baccare, baciare, badware, barbare, barware, bedfere, belaire, betfair, bezaire, bioware, bonaire, bruyere, bugbear, bulgare, bushehr, calcare, carfare, cercare, cithare, cochair, coderre, cogware, compair, compare, confair, convair, correre, corvair, cosmair, costear, cudbear, dan-air, daycare, daymare, daywear, deciare, declare, despair, disheir, dispair, edgware, eelfare, enchair, ensnare, extraer, eyecare, eyewear, fanfare, fatware, februar, finnair, firmare, forbear, funfair, ganbare, geniere, giocare, giurare, guidare, hektare, hilaire, honorar, horaire, hot-air, insnare, kenmare, lancair, lawfare, lefrere, lemaire, lincare, lothair, lunaire, macaire, machair, macnair, malware, markair, mayfair, mid-air, misbear, misfare, miswear, moliere, mundare, nagware, nathair, nazaire, netware, notaire, novoair, nowhere, off-air, opsware, outdare, outwear, owlbear, payware, pc-ware, pentair, pescare, polaire, praxair, prepare, propair, radware, redmare, redware, refaire, requere, ryanair, saltear, sappare, scopare, seaware, silkair, skiwear, sklayre, solaire, spanair, spyware, sundair, suonare, telfair, they're, tinware, tricare, turbare, ultrair, unaware, unswear, upstair, vendere, vulgare, wardair, warfare, wayfair, wayfare, welfare, westair, wetware, wiiware, wizzair, x-chair, yandere

8 letters:
abbaiare, aberdare, actuaire, ad-aware, advacare, advocare, affidare, airstair, alasdair, alastair, alistair, almaguer, annuaire, ant-bear, anywhere, armchair, aryamehr, bakeware, bancaire, bedchair, beerware, bellaire, betaware, biliaire, blogware, bookfair, bouclair, brillare, bruciare, brumaire, bulbaire, bulkware, calcaire, callware, cambiare, canadair, caneware, cardware, careware, caricare, chiamare, clayware, compiere, comprare, cookware, corriere, crapware, crudware, d'spayre, daguerre, day-care, debonair, dedicare, delaware, deleware, demoware, dentaire, derriere, diceware, dishware, divinare, downbear, dromedar, ecolaire, egyptair, ellinair, estuaire, extraire, fibulare, filmfare, firmware, flatware, footware, footwear, forebear, forswear, frimaire, fullfare, giftware, gisclair, glenayre, grancare, grayware, guardare, guaviare, haircare, halosere, handwear, hardware, headwear, homecare, homeware, ignorare, incitare, indicare, invacare, invocare, ironware, judicare, karriere, kelpware, knitwear, knowhere, lactaire, laguerre, landfair, leclaire, libraire, liebherr, lifecare, liveware, loganair, lombaire, longhair, manswear, maturare, maxicare, meatware, medicare, misswear, multiair, nanterre, neckwear, netorare, nevicare, nominare, noteware, novacare, occupare, omnicare, open-air, ordinare, outswear, ovenware, overbear, overcare, overdare, overpair, overwear, p-square, parterre, pedobear, pershare, picapare, pickfair, playwear, poincare, pom-bear, pompiere, populair, potshare, primaire, proshare, rainwear, recitare, revocare, rexxware, rocawear, rwandair, salamair, saltaire, salutare, sancerre, santerre, seminare, set-fair, she-bear, sinclair, skincare, slipware, software, solidare, solitare, solovair, stemware, stuprare, sustaire, swiftair, swimwear, swissair, t-square, tagliare, takecare, tenncare, testiere, theolair, tigerair, treeware, tunisair, uccidere, unbeware, unixware, unrepair, userkare, valclair, veltfare, voltaire, vulgaire, wellcare, wellfare, wickware, wirehair, wootware, workfare, workwear

9 letters:
accendere, aftercare, agateware, alienware, allistair, americare, annoyware, annulaire, antiglare, applecare, backstair, bankshare, base-pair, beachwear, bearshare, beaucaire, beaufrere, bellemare, belluaire, bidriware, birgenair, bloatware, boisclair, brassware, camelhair, camminare, capsquare, childcare, chinaware, codeshare, commutair, compilare, compuware, contraire, costamare, creamware, crimeware, crosshair, culinaire, dancewear, debonaire, deckchair, delftware, demonware, destinare, dinothere, disrepair, distraire, diventare, downstair, dragonair, eachwhere, easy-care, easychair, eldercare, elsewhere, enrojecer, everwhere, everyware, feuerwehr, fieldfare, flintware, flysafair, foreswear, formatear, formulare, frontiere, gelligaer, giudicare, glassware, glossaire, grammaire, grantaire, greenware, groupware, guiltware, gullivair, half-fare, highchair, holloware, home-care, homeshare, honeybear, honoraire, horsehair, houseware, hydrosere, hyperware, implicare, impugnare, innerwear, intercare, inventare, job-share, kare-kare, laoghaire, lapidaire, larosiere, life-care, locataire, luminaire, mainswear, martinair, metalware, microaire, microware, militaire, mindshare, mobiliare, modulaire, montclair, nationair, neurowear, neverware, nightmare, nightwear, nouvelair, numeraire, obamacare, ordinaire, oughwhere, outerwear, pedo-bear, pizzicare, plein-air, populaire, procurare, provocare, pull&bear, pushchair, replicare, ricercare, roeselare, sabotiere, satu-mare, scareware, scaricare, scoppiare, self-care, sereneair, shapewear, sharecare, shareware, shelfware, shorthair, similaire, singulair, slackware, sleepwear, slideware, smartbear, solitaire, somewhere, stagiaire, stoneware, tableware, teddybear, terramare, thyrocare, timeshare, tourtiere, transpare, treenware, trialware, trosclair, underbear, underhair, underware, underwear, urticaire, vaporware, venushair, viaggiare, vulcanair, warioware, whitehair, whiteware, widewhere, wireshare, xiamenair

10 letters:
accumulare, activewear, adversaire, affrontare, air-to-air, antiquaire, appleshare, arbitraire, authorware, bacillaire, bahamasair, ballyclare, basaltware, basketware, bath-chair, beau-frere, beggarware, betterware, biowarfare, bridgeware, bundeswehr, camel-hair, camelshair, capillaire, casualwear, cellulaire, censorware, centenaire, chi-square, child-care, cinemaware, circulaire, cloudflare, code-share, cognoscere, consulaire, continuare, copperware, corollaire, courseware, cuisenaire, debonnaire, deck-chair, deinothere, demandware, dinnerware, disprepare, distinguer, down-share, easy-chair, eau-claire, elbowchair, enamelware, everywhere, farberware, fireflaire, forced-air, formalwear, formulaire, fortalecer, foursquare, frigidaire, funkabwehr, headsquare, healthcare, hollowware, icelandair, illuminare, imaginaire, inventaire, jasperware, jeanpierre, judiciaire, knightmare, lampadaire, laterriere, laverriere, loungewear, lusterware, lustreware, maidenhair, mandataire, middleware, mothercare, nascondere, naviculare, necessaire, neverwhere, orbiculare, otherwhere, pacificare, peltryware, predeclare, proletaire, psammosere, push-chair, queensware, ransomware, rapidshare, reichswehr, renderware, rensenware, retroshare, satisfaire, secondaire, secretaire, self-aware, shovelware, silverware, sisoftware, skillshare, slideshare, smenkhkare, spongeware, sportswear, springhare, streetwear, superflare, teddy-bear, telefonare, temporaire, threadbare, thurghfare, time-share, try-square, tunnelbear, tupperware, understair, valleyfair, vapourware, volontaire, wheelchair, willowware, wonderware, woodenware, yellowware

11 letters:
abandonware, actionnaire, alimentaire, alternacare, apollinaire, articulaire, auriculaire, basse-terre, billionaire, bio-warfare, charityware, commentaire, commissaire, comprendere, contaminare, contrefaire, corningware, crackleware, crippleware, determinare, dimenticare, distinguere, diversicare, doctrinaire, dribbleware, earthenware, eco-warfare, elbow-chair, eveningwear, flightaware, four-square, free-to-air, fritterware, funiculaire, genocidaire, genouillere, gomphothere, graniteware, groundshare, health-care, humanitaire, jean-pierre, jillionaire, kitchenware, lacquerware, leatherwear, legionnaire, leisurewear, marketshare, millionaire, minoritaire, munsingwear, pied--terre, ringraziare, robespierre, salpetriere, significare, silverchair, stopbadware, suicideware, tartamudear, vanillaware, vendemiaire, zillionaire

12 letters:
brochureware, buenos-aires, cloudcompare, codeanywhere, cyberwarfare, destinataire, dictionnaire, documentaire, donationware, fromsoftware, gestionnaire, grande-terre, grandpoobear, hebdomadaire, managed-care, market-share, millionnaire, morris-chair, mousquetaire, over-the-air, paratonnerre, passe-pierre, perce-pierre, pied-a-terre, postcardware, questionaire, rudimentaire, saint-pierre, savoir-faire, thoroughfare, three-square, trillionaire, twisted-pair

13 letters:
cargologicair, carton-pierre, communautaire, computershare, detentionaire, euromobiliare, gazillionaire, kajillionaire, knowledgeware, laisser-faire, laissez-faire, multicoreware, parlementaire, pieds-a-terre, pointe-claire, questionnaire, ready-to-wear, rocking-chair, saint-nazaire, wash-and-wear

14 letters:
ausgangssperre, chamillionaire, cinquantenaire, commissionaire, concessionaire, devil-may-care, extraordinaire, intensive-care, opencourseware, printnightmare, pythonanywhere, surface-to-air

15 letters:
commissionaire', commissionnaire, concessionnaire, fahrzeugpapiere, fair-and-square, ferney-voltaire, maschinengewehr

16 letters:
centibillionaire, heavier-than-air, lighter-than-air, multimillionaire, pitiesalpetriere, superantispyware, volkssturmgewehr

17 letters:
multi-billionaire, weston-super-mare

18 letters:
anytime...anywhere, solitude/solitaire

1 letter:
r

2 letters:
ar, or, er, r.

3 letters:
bur, mir, for, jar, npr, par, fur, mar, war, far, oar, ore, gar, ear, car, ayr, tor, sir, are, ire, cur, nor, bar, tar, per, fir

4 letters:
deer, lore, more, sour, slur, poor, lour, gore, torr, rear, door, bore, weir, year, tyre, amir, dire, boer, veer, were, spar, gear, hire, boar, lear, core, hour, star, boor, near, sore, tier, sure, jeer, yore, wore, pore, soar, moor, sear, meir, cure, four, doer, fear, fore, carr, scar, your, bier, parr, burr, fire, czar, wire, pour, dour, tsar, blur, birr, lyre, tore, hear, sere, mire, beer, char, spur, emir, dear, pure, ruhr, hoar, seer, lure, mere, thor, purr, peer, stir, here, tour, roar, barr, adar, pier, abor, fahr, gere, igor, jour, lohr, voir

5 letters:
score, loire, moore, assur, barre, whore, crore, churr, queer, snore, skier, ameer, sitar, drear, qatar, whirr, chore, scour, defer, cheer, afire, store, amour, spore, dower, senor, demur, steer, safar, corps, shirr, babar, unbar, we're, chirr, inure, shore, floor, myrrh, spear, sneer, inter, quire, shear, adore, dakar, abhor, incur, shire, sheer, dinar, bazar, flour, zaire, spoor, occur, refer, blear, starr, clear, moire, infer, deter, spire, smear, decor, murre, swore, recur, cigar, asarh, ashir, astir, athar, bihar, damar, debar, greer, grier, kotar, lamar, maher, sapir, selar, vanir, vidar, yasir

6 letters:
lekvar, appear, impure, secure, velour, insure, guitar, drawer, career, confer, sphere, ensure, assure, immure, bazaar, aspire, adjure, galore, vigour, endear, disbar, unsure, endure, ignore, squire, retire, concur, rehear, tumour, cohere, valour, severe, prewar, detour, mature, before, qintar, poseur, ashore, vapour, prefer, manure, you're, veneer, demure, revere, adhere, savour, voyeur, allure, admire, expire, abjure, anshar, bonior, cottar, devoir, exmoor, fakeer, inhere, isobar, jamjar, kaffir, lenore, lontar, menhir, nuphar, pindar, rigour, safire, salvor, sambar, sambur, schorr, secpar, shamir, shmear

7 letters:
austere, compere, verdure, myanmar, respire, rapport, pasteur, unclear, inshore, liqueur, premier, anymore, schmear, require, deplore, pioneer, inquire, postwar, saviour, masseur, cashier, inspire, sincere, restore, bizarre, couture, compeer, danseur, succour, obscure, fervour, procure, explore, flavour, implore, besmear, bonheur, co-star, cooccur, flexure, gravure, guinier, hachure, houhere, kildeer, languor, minibar, nervure, outroar, rancour, samovar, shophar, soilure, tangier, tarsier, tonsure, tussore, vitharr, wafture

8 letters:
brochure, grimoire, overhear, nightjar, polypore, reappear, engineer, reinsure, seigneur, souvenir, cavalier, offshore, saboteur, mutineer, frontier, frotteur, grandeur, immature, domineer, monsieur, reassure, premiere, perspire, transfer, abampere, abattoir, allosaur, amanpour, baccilar, barosaur, coiffeur, coiffure, coinsure, elaphure, encolure, ex-mayor, footgear, footsure, hot-wire, killdeer, lavalier, longueur, markhoor, microbar, muleteer, outscore, paramour, peignoir, scimitar, sinecure, tamanoir, twoscore, voussoir, wheatear

9 letters:
balladeer, guarantor, buccaneer, puppeteer, superstar, chevalier, raconteur, disappear, insincere, musketeer, persevere, premature, gondolier, volunteer, profiteer, interfere, bandolier, racketeer, sightseer, chauffeur, financier, brigadier, belvedere, apatosaur, archosaur, bandoleer, basketeer, cannoneer, cared-for, fourscore, gadgeteer, gazetteer, guinevere, hadrosaur, hekmatyar, hoped-for, kala-azar, megathere, nothosaur, pistoleer, presbyter, privateer, pterosaur, rest-cure, sloganeer, sonneteer, stegosaur, trochlear, warrantor, wasteweir

10 letters:
quadrature, bombardier, chandelier, charioteer, escritoire, commandeer, underscore, heretofore, auctioneer, ankylosaur, baudelaire, belshazzar, blackamoor, brontosaur, carabineer, ceratosaur, cockleburr, embouchure, gondoliere, halberdier, harpooneer, ictodosaur, kieselguhr, longed-for, looked-for, man-of-war, pelycosaur, plesiosaur, re-explore, scrutineer, seismosaur, smoothbore, threescore, tug-of-war, uintathere, wished-for

11 letters:
pamphleteer, uncared-for, litterateur, connoisseur, rectilinear, ichthyosaur, interlinear, candidature, corythosaur, dromaeosaur, dyaus-pitar, liquidambar, milliampere, rotogravure, styracosaur, supersedure, tyrannosaur, ulaanbaatar, unhoped-for, volt-ampere, yearned-for

12 letters:
entrepreneur, restaurateur, aide-memoire, heliogravure, photogravure, psittacosaur, staurikosaur, uncalled-for, unlooked-for, unwished-for

13 letters:
conventioneer, conservatoire, porte-cochere

15 letters:
kilovolt-ampere

16 letters:
pachycephalosaur