2 letters:
c4, m4, or

3 letters:
cor, for, lor, mor, nor, oar, ohr, ore, orr, por, sor, tor, war, wor

4 letters:
abor, ador, baur, boar, boer, bohr, bore, coar, cohr, core, corr, d'or, dior, doar, dohr, door, dore, dorr, flor, fore, forr, four, glor, goar, gore, gorr, hoar, horr, hors, ifor, igor, kohr, laur, loar, lohr, lore, mohr, more, morr, ngor, nohr, pore, porr, pour, roar, rohr, saur, scor, shor, soar, sore, thor, tore, torr, vore, warr, wore, yore, your

5 letters:
-bore, -saur, -vore, 0-8-4, 2-8-4, 4-4-4, 4-6-4, 4-8-4, aam-4, abhor, accor, adoor, adore, adour, affor, afore, ah-64, ak-74, albor, amcor, amd64, amlor, an-94, ancor, angor, apcor, arfor, arm64, as-44, asoar, auror, ba-64, basor, bator, becor, blore, bm-14, bm-24, bmd-4, boere, bogor, bor-4, borre, bsfor, btr-4, c-704, cat-4, cd154, chlor, chore, cifor, clore, coare, comor, corps, coure, crore, cxcr4, d-war, dacor, decor, devor, dm2a4, doerr, doore, dp-64, e.164, e2-e4, elcor, encor, epcor, exmor, f-104, faure, film4, floor, flor-, flore, fomor, fore-, frore, g.984, gabor, gaure, glaur, gloar, glore, glut4, gm-94, h.264, hoare, hoerr, hycor, ia-64, icore, ilmor, incor, iscor, izvor, jacor, javor, knorr, lalor, laure, lazor, lepor, livor, loehr, lorre, mador, mafor, maure, mazor, mcore, mejor, melor, mhorr, mi-24, moore, more4, morre, moure, nador, nagor, nat64, ndour, nicor, nucor, nycor, oct-4, oncor, onore, opfor, otpor, plore, porre, ppc64, pro14, prore, pylor, quare, qx-04, rg-34, roehr, safor, scaur, schor, score, sedor, senor, shoar, shore, shorr, sihor, smore, snore, soare, sobor, spaur, spore, sr.n4, stm-4, stohr, store, storr, sts-4, su-14, su-24, su-34, sun-4, swore, tepor, thore, thorr, ticor, timor, torre, tvn24, unit4, vega4, vf-74, vlore, whare, whore, wicor, woehr, wow64, wu-14, xicor, zagor, zamor, zocor, zukor

6 letters:
-chore, 2-10-4, 2n3904, 4-14-4, aancor, afore-, aida64, ak-104, amador, amcore, anacor, and/or, apport, arcore, ardour, ashore, balaur, bancor, bangor, base64, bbv154, bedore, before, begore, bercor, bezoar, biowar, blazor, botwar, btr-94, cafe24, calore, cars24, cctv-4, cencor, chador, chlor-, chlore, concor, cromor, cs/lr4, ctla-4, cyp3a4, damore, delcor, delore, digi24, do-204, do-214, do-254, drawer, eeyore, ekabor, elnore, emcore, en-dor, encore, engore, epicor, feofor, fluor-, fragor, galore, gaz-14, gaz-24, gaz-64, gedore, gencor, golore, guilor, gungor, heitor, hi-cor, ignore, indoor, inocor, isidor, isopor, j-core, j-sh04, jambor, karkor, kian84, kishor, krikor, labore, lahore, lamaur, legore, lenore, lodore, lodwar, maejor, mahore, marcor, mega64, mentor, mli-84, mordor, mpeg-4, mysore, naswar, navfor, nayaur, netwar, newcor, octuor, okafor, open64, pagcor, parore, pc/104, pepkor, phwoar, pine64, pintor, prewar, pricor, quaoar, rebore, repour, rpk-74, rumore, salvor, samcor, schorr, shihor, shnorr, sombor, sopore, sordor, spinor, splore, sporo-, stoehr, sts-94, sudore, suncor, syncor, tadmor, tagore, talmor, tambor, tat-14, tenore, teodor, tofore, toz-34, tracor, tricor, tu-204, turpor, tuscor, unicor, unifor, upbore, uproar, upsoar, valore, vapour, vencor, vfa-34, vsk-94, x86-64, xplore, zbd-04, zippor

7 letters:
2-8-8-4, 4-8-8-4, aarch64, alticor, andorre, anim8or, antiwar, anymore, ardmore, armscor, arp4754, avantor, aviador, bedsore, belcore, bewhore, bigorre, borgore, bruncor, c-store, candour, cantore, cazador, centaur, chicore, clarcor, countor, criador, deplore, e-store, earsore, ecuador, eleonor, emplore, enstore, equador, equicor, explore, eyesore, f-score, fahlore, faxlore, filmore, forlore, ganador, gencorp, gilgore, goldcor, hardwar, hla-dr4, humidor, implore, infowar, inodore, inshore, instore, isidore, jugador, kenmore, kir2dl4, kishore, landour, languor, lemoore, longcor, manacor, matador, mech-x4, meritor, mevacor, mirador, mogador, moidore, nellcor, noncore, novacor, onshore, oradour, outdoor, outpour, outroar, outsoar, outwore, pandoor, pandour, parador, pastore, pegador, pezcore, picador, pledgor, polydor, postwar, pre-war, pro-war, quatuor, rapport, reddour, reiser4, rescore, restore, sadcore, samobor, schnorr, semilor, sindoor, sofamor, specwar, sts-114, sts-134, synacor, tandoor, tengwar, tussore, umicore, unicore, unswore, usa-224, vfa-154, vfa-204, vibgyor, vma-214, volador, webcore, wist-94, z-score, zil-114

8 letters:
aberdour, acusador, aetosaur, albacore, albicore, all-on-4, allosaur, an/pvs-4, animador, anti-war, aparador, armentor, avenzoar, backdoor, bahadoor, baikonur, balasore, balisaur, bangalor, bardcore, barndoor, barosaur, baykonur, bayshore, bellcore, biltmore, biochore, booklore, borrador, brigador, buscador, caveator, centaure, centocor, chrysaor, claymore, comscore, contador, control4, corocore, crabcore, darkcore, datalore, davie504, deplorre, detracor, dictador, dinosaur, dogshore, drawbore, dukhobor, dummador, easycore, egregore, elsinore, en-hazor, evercore, evermore, ex-mayor, fakelore, fenimore, fidelcor, finamore, flamewar, foamcore, folclore, folivore, folklore, footsore, forswore, fundador, gartmore, genencor, genitore, glaymore, glencore, glenmore, gonopore, gweedore, halicore, hardcore, haridwar, helium-4, hogscore, hurtcore, in-store, indolore, jib-door, kaochlor, killgore, kishtwar, labrador, laramore, locavore, luchador, maiasaur, mandsaur, manofwar, manwhore, marcador, matadore, mathcore, metafore, minotaur, mokadour, mosasaur, mucivore, mylapore, nanosaur, nerdcore, nextdoor, non-core, normcore, offshore, opendoor, openh264, outscore, outwhore, overdoor, overmore, pair-oar, paramore, pershore, pescador, phar-mor, phosphor, pinafore, pledgeor, pliosaur, polypore, polyvore, portador, post-war, prescore, prestore, pylagore, radiador, rallador, raspador, re-store, retepore, roncador, rossmore, seafloor, seashore, selangor, semitaur, servifor, sicamore, siquijor, sixscore, slowcore, softcore, subfloor, svetofor, sycamore, tambocor, ten-four, theodore, therefor, toystore, trapdoor, tubipore, two-door, two-four, twoscore, unprofor, val-d'or, venusaur, vmfa-124, vmfa-314, wellbore, what-for, wherefor, windbore, worldwar, zil-4104, zoochore, zoospore, zsu-23-4

9 letters:
2-8-8-8-4, admirador, alentador, amanitore, ambasador, americorp, amplocore, an/pvs-14, apatosaur, archosaur, aspirador, atriopore, back-door, backshore, balthazor, baltimore, bandalore, bangalore, barn-door, barrymore, beardmore, belphegor, bookstore, breakcore, bucentaur, bulbasaur, carbon-14, cared-for, carnivore, carnosaur, citescore, collymore, commodore, comprador, cornfloor, crunkcore, cuddalore, darkspore, deathcore, deinosaur, dermstore, dinosaure, doukhobor, drugstore, dual-core, dumbledor, either-or, either/or, el/m-2084, embraceor, emperador, eurocorps, fennimore, foot-sore, foreshore, four-door, fourscore, frontdoor, frugivore, full-bore, galtymore, ghostlore, glassdoor, granivore, graphcore, grindcore, gs-441524, guarantor, hackamore, hadrosaur, hannelore, hard-core, herbivore, hockamore, holodomor, hoped-for, hyleosaur, indicador, inter-war, jageshwar, khelaghor, lakeshore, livermore, longshore, madrepore, maheshwar, man-o-war, mangalore, manticore, megastore, metalcore, micropore, millipore, mingw-w64, mockadour, mont-dore, mostrador, multicore, musescore, navegador, nearshore, neuropore, nevermore, next-door, nightcore, ninescore, northmore, nothosaur, nullipore, off-shore, open-door, ordenador, overscore, overstore, phytosaur, piscivore, pitch-ore, project64, provedore, providore, pterosaur, quasi-war, queercore, quinotaur, roquemore, ruddigore, russia-24, salvatore, serpentor, singapore, singapour, soft-core, sophomore, sotomayor, spatafore, speedcore, splendour, stegosaur, stevedore, taaqatwar, teleosaur, therefore, thermidor, trap-door, trovatore, ultracore, undergore, wardcorps, warnstore, warrantor, wherefore, xkeyscore

10 letters:
acetochlor, acumulador, airexplore, alongshore, americorps, an/alq-144, anemochore, ankleshwar, ankylosaur, apishamore, arvidsjaur, asegurador, baal-hazor, battledoor, battledore, bensenyore, blastopore, brontosaur, ceratosaur, clearscore, compradore, consumidor, cotylosaur, dancefloor, drug-store, dumbledore, eightscore, elasmosaur, encantador, espectador, fifty-four, finedrawer, forty-four, framestore, frenchcore, gobernador, goblincore, hardvapour, healthcorp, heretofore, horrorcore, hwasong-14, hylaeosaur, ictodosaur, impetigore, jaatishwar, jagjaguwar, jubbulpore, justacorps, kalpeshwar, libertador, longed-for, looked-for, man-of-war, masticador, megalosaur, men-of-war, montefiore, montemayor, mukteshwar, mumblecore, murdeshwar, nethermore, obio-akpor, onocentaur, pareiasaur, pelycosaur, pisanosaur, plesiosaur, pyrochlore, re-explore, rocamadour, seismosaur, sevenscore, sixty-four, skerryvore, small-bore, smoothbore, straight-4, streetcore, supermajor, superstore, swarmspore, swarthmore, tarakeswar, thrashcore, threescore, titanosaur, top-drawer, travancore, troubadour, tubulipore, tug-of-war, underfloor, underscore, ventilador, villasenor, whiggamore, wished-for, withdrawer

11 letters:
auspuffrohr, avant-corps, barrackpore, bhubaneswar, blunderbore, bolbbalgan4, bron-yr-aur, catalizador, celebrimbor, cinemascore, closed-door, colaborador, comunicador, conservador, controlador, corythosaur, desertshore, despertador, detritivore, dnyaneshwar, dromaeosaur, eighty-four, el-salvador, farthermore, finger-four, first-floor, forevermore, furthermore, herrerasaur, ichthyosaur, justaucorps, kinetochore, neithermore, ninety-four, numb/encore, nutri-score, ornithosaur, out-of-door, phytobezoar, planktivore, privatecore, raffreddore, rhynchosaur, saddle-sore, silenciador, singlestore, smooth-bore, styracosaur, therebefore, theretofore, thirty-four, three-score, toothdrawer, triplestore, twelvescore, twenty-four, two-by-four, tyrannosaur, uncared-for, underinsure, unhoped-for, uranium-234, wire-drawer, yearned-for

12 letters:
amortiguador, bhubaneshwar, cavalli-sfor, chrysochlore, clue-by-four, conquistador, distributore, door-to-door, exclusive-or, four-by-four, ground-floor, hereinbefore, hippocentaur, inspiration4, maroochydore, psittacosaur, refrigerador, rodomontador, san-salvador, seventy-four, sloop-of-war, staurikosaur, trichobezoar, uncalled-for, unlooked-for, unwished-for, wiiconnect24, without-door

13 letters:
administrador, argentinosaur, atlas-centaur, badroulbadour, chandernagore, electronicore, flightradar24, lithophosphor, mahabaleshwar, mesocarnivore, nephridiopore, partynextdoor, plutonium-244, post-hardcore

14 letters:
circumferentor, coach-and-four, destornillador, durr-e-shehwar, garhmukteshwar, hypercarnivore, indoor-outdoor, javascriptcore, revolving-door, sweet-and-sour

15 letters:
happened-before, madhyamaheshwar, shuttle-centaur, siddharameshwar, unaccounted-for, x-forwarded-for

16 letters:
pachycephalosaur, webstaurantstore

17 letters:
four-on-the-floor

22 letters:
idontwannabeyouanymore

23 letters:
tetrahydrocannabinol-c4

6 letters:
acinar, avatar, acular

7 letters:
rattler, aquifer, manager, samovar, tanager, amateur, papaver, saddler, annular, handler, basilar, wagoner, caliber, jacamar, malodor, palaver, angular, caliper, janitor, battler, dabbler, paddler

8 letters:
balancer, canister, bachelor, lavender, prattler, scapular, traveler, vascular, fastener, diameter, ampullar, granular, cavalier, wrangler, catheter, calendar, cannular, examiner, falconer, massacre, waggoner, baluster, zanzibar, oracular, adductor, cadastre, calender, vladimir

9 letters:
avascular, cannoneer, glandular, traveller, handlebar, lancaster, bannister, sapsucker, scavenger, capacitor, absconder, decameter, parameter, excalibur, canvasser, bandoleer, passenger, gadgeteer, phalanger, tablature, decaliter, elastomer, dekameter, kala-azar, agateware, blastular, camelhair, dekalitre, gallagher, handcolor, hexameter, octameter

10 letters:
enamelware, lacklustre, ambassador, chancellor, embassador, atmosphere, landlubber, clawhammer, enantiomer, vernacular, triangular, acetabular, challenger, blackamoor, lackluster, blastomere, blasphemer, hexangular, lapplander, octangular, pentameter, saltshaker

11 letters:
crackleware, spectacular, rectangular, grandmother, gametophore, pentangular, straphanger, entablature, graniteware

12 letters:
peradventure, half-brother, milliammeter, blastosphere, stratosphere, semidiameter, zip-fastener

14 letters:
cardiovascular, cross-examiner