1 syllable:
a., ae, ay, bay, bey, brae, bray, cay, che, chez, clay, dae, day, dey, dray, drey, fay, faye, fe, fey, flay, fray, frey, gay, gray, grey, hay, hey, j, j., jay, k, k., kay, kaye, lay, lei, ley, mae, may, nay, neigh, ney, pay, paye, pei, pray, prey, rae, ray, re, rea, rey, say, shay, shea, skreigh, slay, sleigh, spay, splay, spray, stay, stray, sway, tae, tay, they, tray, tre, trey, v-day, way, wei, weigh, wey, whey, wray, wy, yay, yea

2 syllables:
aa, abbe, airway, allay, alway, andre, andrei, antae, archway, array, ashtray, astray, away, aweigh, ba, backstay, ballet, belay, beltway, benday, benet, beret, betray, birthday, bobsleigh, bobstay, bombay, bouquet, bouyei, briquet, broadway, buffet, bullae, bursae, byplay, byway, cache, cafe, calais, cathay, causeway, chalet, circlet, clearway, cliche, convey, coquet, crochet, croquet, crossway, dalai, danae, decay, defray, deka-, delay, dismay, display, dk, dolce, donee, doomsday, doorway, downplay, driveway, duce, embay, entree, essay, estray, fairway, filet, fillet, flyway, footway, foreplay, franglais, freeway, friday, gainsay, gangway, gateway, gourmet, greenway, gunplay, half-pay, halfway, hallway, hatchway, headway, hearsay, heyday, highway, hooray, horseplay, in-tray, inlay, inveigh, jackstay, jose, keyway, latte, leeway, long-play, mackay, madre, mainstay, manet, marseille, marseilles, mcveigh, melee, midday, midway, mislay, misplay, moirae, monday, monet, moonray, moray, mornay, newsday, nikkei, nisei, noonday, norway, noway, obey, off-day, oj, ok, okay, one-way, out-tray, outlay, outplay, outstay, outweigh, padre, palmae, parcae, parfait, parkway, parquet, passe, pathway, payday, picquet, pipe-clay, piquet, plantae, playday, pleurae, portray, prepay, puree, purvey, raceway, railway, reggae, relay, rene, renee, repay, replay, risque, roadway, rochet, roleplay, ropeway, roquet, rosebay, roue, runway, sachet, sansei, saute, screenplay, seaway, sensei, sergei, shipway, sickbay, sideway, skyway, slipway, sluiceway, soiree, someday, someway, soothsay, sorbet, souffle, speedway, spillway, spirea, stairway, sternway, stingray, straightway, subway, sunday, sunray, survey, swordplay, taipei, theaceae, three-way, throughway, thruway, thursday, tideway, today, tokay, toupee, tramway, tuesday, two-way, unlay, unsay, valet, walkway, waylay, wednesday, weekday, wordplay, workday, x-ray

3 syllables:
a-okay, aaa, aba, afsane, alcidae, alleyway, anyway, apidae, araneae, arete, attache, baa, bambuseae, banneret, beaujolais, bothidae, bovidae, bovinae, bramidae, breakaway, bta, cabaret, cabernet, caliche, caranday, caraway, carburet, carraway, carriageway, castaway, cea, cellaret, chalcidae, chermidae, chevrolet, cia, clusiaceae, congridae, consomme, corvidae, counterplay, counterweigh, curare, dacninae, day-to-day, degree-day, disarray, disobey, divorcee, dna, dominee, dossier, emigre, entranceway, equidae, everyday, expressway, faculae, faraday, faraway, fiance, fireclay, floweret, foldaway, forestay, formulae, galloway, gavidae, gerridae, getaway, giveaway, hemingway, hideaway, hogmanay, holiday, hostaceae, icetray, infante, interplay, intraday, ioway, jfk, kahane, kkk, lampridae, lanneret, latter-day, layaway, lingerie, lobate, lutrinae, lyonnais, maconnais, macrame, mandalay, mangabey, manidae, mantidae, matinee, mba, melinae, menurae, merginae, mfume, miridae, monterey, motorway, mullidae, mulloway, myaceae, nba, nepidae, nyssaceae, off-broadway, ojibway, oleaceae, orleanais, overlay, overpay, overplay, overstay, overweigh, papillae, paraguay, paridae, paroquet, parroquet, passageway, percidae, perrier, phasmidae, phillidae, pholidae, piaget, picidae, pipeclay, plastique, pluteaceae, poaceae, pongidae, present-day, protege, protegee, rabelais, ratitae, reconvey, resume, resurvey, ricochet, rockaway, roundelay, runaway, saturday, sequelae, sobriquet, solleret, soubriquet, sphyrnidae, spinneret, squillidae, steerageway, sterninae, stowaway, straightaway, swimmeret, takeaway, tearaway, tenebrae, throwaway, toothache, turdinae, typhaceae, underlay, underpay, underplay, underway, uruguay, usa, valvate, vertebrae, virelay, walkaway, waterway, whitsunday, workaday, yenisei, yesterday

4 syllables:
adelgidae, aepyornidae, akeridae, aloeaceae, andromache, annunciate, anserinae, araceae, asea, auto-da-fe, balanidae, bioassay, blenniidae, brassicaceae, cabriolet, cama, cannaceae, carangidae, carapidae, carduelinae, cathartidae, charophyceae, chelydridae, chlorophyceae, communique, companionway, compositae, corixidae, cotingidae, cyatheaceae, cybercafe, day-after-day, didelphidae, dorylinae, dugongidae, elapidae, elopidae, examinee, fabaceae, foia, fringillidae, funkaceae, garrulinae, geastraceae, gerbillinae, giraffidae, gobiidae, guttiferae, half-holiday, halictidae, hepaticae, hexanchidae, hominidae, hyaenidae, hydrangeaceae, hydrophidae, labiate, lemnaceae, liliaceae, liliidae, loriinae, lythraceae, marsileaceae, mephitinae, mniaceae, moraceae, myctophidae, naivete, neritidae, noaa, numidinae, nymphaeaceae, olivier, otididae, out-of-the-way, papier-mache, pas-de-calais, passeridae, pempheridae, peneidae, percophidae, phaethontidae, picariae, pinaceae, podargidae, podaxaceae, portunidae, proteaceae, pythoninae, rapateaceae, rhamnaceae, roquelaure, rosaceae, ruscaceae, salmonidae, sapindaceae, sarcoptidae, schizaeaceae, sciuridae, scleroparei, scorpaenidae, sirenidae, sisyridae, sphyraenidae, staphylaceae, stomachache, superhighway, sylviidae, sylviinae, taccaceae, thermopylae, toxotidae, trapaceae, trichiuridae, trogonidae, tylenchidae, typhlopidae, tytonidae, ulvaceae, unionidae, usneaceae, viscaceae, vitaceae, viverrinae, vombatidae, winteraceae, xanthophyceae, zepa

5 syllables:
acoraceae, agavaceae, alismatidae, amentiferae, amphioxidae, amphisbaenidae, annonaceae, asteraceae, atherinidae, bangiaceae, burseraceae, calliphoridae, capitonidae, caprimulgidae, capromyidae, cariamidae, carpinaceae, celastraceae, centropomidae, cephalobidae, chlorophthalmidae, curculionidae, cynoscephalae, cyperaceae, doliolidae, dracenaceae, droseraceae, ebenaceae, empetraceae, endamoebidae, equisetatae, erysiphaceae, filoviridae, flaviviridae, gentianaceae, geometridae, geomyidae, gonorhynchidae, heterokontae, hirudinidae, holocentridae, hydrobatidae, hydrochoeridae, hydromyinae, ichneumonidae, immunoassay, isuridae, katsuwonidae, kinosternidae, meliaceae, meliphagidae, mimosoideae, muscicapidae, musophagidae, myristicaceae, nord-pas-de-calais, notonectidae, notoryctidae, ochotonidae, odobenidae, onagraceae, palaemonidae, pandionidae, pelecanidae, peripatidae, phalaropidae, phanerogamae, phylloxeridae, pinnotheridae, piperaceae, plasmodiidae, platanaceae, pleuronectidae, potoroinae, procyonidae, pseudococcidae, pyrolaceae, pythiaceae, rhinolophidae, rhyniaceae, roccellaceae, rubiaceae, salamandridae, sarcoscyphaceae, struthionidae, tetraonidae, theridiidae, trombidiidae, tuberaceae, umbelliferae, vireonidae, zamiaceae, zosteraceae

6 syllables:
acanthisittidae, ambystomatidae, anacardiaceae, anarhichadidae, anomalopidae, apocynaceae, arenaviridae, asparagaceae, aspleniaceae, athiorhodaceae, athyriaceae, bignoniaceae, branchiobdellidae, burmanniaceae, callionymidae, cecropiaceae, chamaeleonidae, chamaeleontidae, chytridiaceae, cladoniaceae, clavariaceae, cunoniaceae, dactyloscopidae, dicksoniaceae, elaeagnaceae, electrophoridae, eriocaulaceae, euphorbiaceae, fouquieriaceae, geraniaceae, gesneriaceae, haloragaceae, helotiaceae, heteromyidae, hippopotamidae, hygrophoraceae, lecanoraceae, leitneriaceae, leptotyphlopidae, lobeliaceae, loganiaceae, lycopodineae, malaconotinae, malpighiaceae, marattiaceae, martyniaceae, megapodiidae, melampsoraceae, melanthiaceae, monotropaceae, myliobatidae, myrmeleontidae, orectolobidae, ornithorhynchidae, paeoniaceae, papilionoideae, parkeriaceae, passifloraceae, pcmcia, peristediinae, podocarpaceae, polypedatidae, polypodiaceae, polyporaceae, ptilonorhynchidae, pucciniaceae, recurvirostridae, rhizobiaceae, rhizophoraceae, rickettsiaceae, salviniaceae, saxifragaceae, scheuchzeriaceae, sparganiaceae, sphaeriaceae, sphaerocarpaceae, sterculiaceae, strelitziaceae, strophariaceae, synchytriaceae, taxodiaceae, thelephoraceae, tilletiaceae, vespertilionidae, vittariaceae, volvariaceae, welwitschiaceae, xylariaceae, zingiberaceae

7 syllables:
allioniaceae, alstroemeriaceae, araucariaceae, caesalpiniaceae, caesalpinioideae, convallariaceae, cortinariaceae, dipterocarpaceae, elaeocarpaceae, entomophthoraceae, grossulariaceae, jungermanniaceae, lophosoriaceae, nidulariaceae, oedogoniaceae, papilionaceae, peronosporaceae, pertusariaceae, polemoniaceae, polyangiaceae, potamogetonaceae, rhodymeniaceae, sarraceniaceae, sciadopityaceae, sclerotiniaceae, scrophulariaceae, tetragoniaceae, uvulariaceae

8 syllables:
aristolochiaceae, lentibulariaceae, oscillatoriaceae, plasmodiophoraceae, radioimmunoassay, tuberculariaceae