1 syllable:
air, ar, are, ayr, bar, bare, barr, barre, bear, beer, bier, birr, blair, blare, blear, blur, boar, boer, bore, bur, burr, car, care, carr, chair, char, cheer, chirr, chore, churr, claire, clear, core, corps, crore, cur, czar, dare, dear, deer, dire, doer, door, dour, dower, drawer, drear, ear, er, err, fahr, fair, far, fare, fear, fehr, fir, fire, flair, flare, floor, flour, for, fore, four, freyr, fur, gar, gear, gere, glare, gore, greer, grier, hair, hare, hear, heir, here, herr, hire, hoar, hour, ire, jar, jeer, jour, lair, lear, lohr, loire, lore, lour, lyre, maher, mar, mare, meir, mere, mir, mire, moire, more, murre, myrrh, ne'er, near, nor, oar, or, ore, pair, par, pare, parr, pear, peer, per, pier, poor, pore, pour, prayer, purr, queer, quire, r, r., rare, rear, roar, scar, scare, schmear, schorr, score, scour, sear, seer, sere, share, shear, sheer, sherr, shire, shirr, shmear, shore, sir, slur, smear, snare, sneer, snore, soar, sore, sour, spar, spare, spear, sphere, spire, spore, spur, square, squire, stair, star, stare, starr, steer, stir, store, swear, swore, tar, tear, their, there, they're, thor, tier, tor, tore, torr, tsar, tyre, veer, voir, war, ware, we're, wear, weir, were, where, whirr, whore, wire, wore, year, yore

2 syllables:
abhor, abor, adar, adhere, admire, adore, affair, affaire, afire, aflare, amir, amour, anshar, appear, asarh, ashir, ashore, aspire, astaire, astir, athar, austere, aware, babar, bazaar, bazar, before, besmear, beware, bihar, bizarre, bonaire, bonheur, bonior, brumaire, bugbear, cared-for, career, cashier, chauffeur, cigar, co-star, cohere, coiffeur, compare, compeer, compere, concur, confer, cooccur, cottar, dakar, damar, danseur, debar, declare, decor, defer, demur, deplore, derriere, despair, deter, devoir, dinar, disbar, downstair, eclair, emir, endear, ensnare, expire, explore, fakeer, footgear, forbear, forswear, fourscore, foursquare, frontier, frotteur, galore, grandeur, grimoire, guinier, guitar, handwear, horsehair, hot-wire, houhere, ignore, igor, immure, impair, implore, incur, infer, inhere, inquire, inshore, inspire, inter, jamjar, kaffir, kildeer, killdeer, kotar, lamar, languor, lenore, liqueur, longed-for, longueur, lontar, menhir, midair, moliere, monsieur, myanmar, nightjar, nuphar, o'hare, occur, offshore, outroar, outscore, parterre, pasteur, peignoir, perspire, pierre, pindar, poseur, postwar, prefer, premier, premiere, prepare, prewar, pushchair, qatar, rapport, recur, refer, rehear, repair, require, respire, restore, retire, revere, safar, safire, salvor, sambar, sambur, sapir, secpar, seigneur, selar, senor, severe, shamir, shophar, sightseer, sincere, sitar, smoothbore, t-square, tangier, tarsier, testiere, threescore, transfer, trochlear, tussore, twoscore, unclear, unfair, upstair, vanir, vapour, velour, veneer, vidar, vitharr, voltaire, voussoir, voyeur, wasteweir, wheatear, yasir, zaire

3 syllables:
abampere, abattoir, aide-memoire, air-to-air, allosaur, ankylosaur, anymore, archosaur, auctioneer, baccilar, balladeer, bandoleer, bandolier, barosaur, basketeer, baudelaire, belshazzar, belvedere, billionaire, bombardier, brigadier, brontosaur, buccaneer, cannoneer, cavalier, chandelier, chevalier, chinaware, cockleburr, commandeer, connoisseur, debonair, debonaire, debonnaire, disappear, disrepair, doctrinaire, domineer, engineer, escritoire, ex-mayor, financier, gadgeteer, gazetteer, gomphothere, gondolier, gondoliere, guarantor, guinevere, hadrosaur, halberdier, harpooneer, hekmatyar, heretofore, hoped-for, insincere, interfere, isobar, kieselguhr, laissez-faire, lavalier, looked-for, man-of-war, megathere, microbar, millionaire, minibar, muleteer, musketeer, mutineer, nothosaur, npr, open-air, overbear, overhear, pamphleteer, persevere, pied-a-terre, pioneer, pistoleer, plesiosaur, porte-cochere, presbyter, privateer, profiteer, pterosaur, puppeteer, questionnaire, racketeer, raconteur, re-explore, reappear, restaurateur, saboteur, samovar, savoir-faire, scimitar, scrutineer, secretaire, seismosaur, sloganeer, solitaire, sonneteer, souvenir, stegosaur, superstar, tamanoir, tug-of-war, unaware, uncalled-for, underscore, volt-ampere, volunteer, warrantor, wirehair, wished-for, yearned-for

4 syllables:
apatosaur, carabineer, ceratosaur, charioteer, commissionaire, concessionaire, conservatoire, conventioneer, corythosaur, dromaeosaur, dyaus-pitar, ichthyosaur, ictodosaur, kala-azar, liquidambar, litterateur, milliampere, pelycosaur, psittacosaur, staurikosaur, styracosaur, surface-to-air, tyrannosaur, uintathere, ulaanbaatar, uncared-for, unhoped-for, unlooked-for, unwished-for

5 syllables:
kilovolt-ampere

6 syllables:
pachycephalosaur