1 syllable:
ai, aye, bae, bi, bligh, buy, by, bye, cai, chai, chi, cry, cy, dai, die, dry, dye, fae, fi, fly, fry, frye, guy, hi, high, hy, hye, i, i., kai, kwai, lai, lie, ly, lye, mai, mei, my, nigh, nye, pe-tsai, phi, pi, pie, ply, pri, pry, psi, pye, rye, sai, shy, sigh, sky, skye, sly, spry, spy, sty, sy, tai, thai, thigh, thy, tie, tri, try, ty, tye, vi, vie, wai, why, wry, wye, y, y.

2 syllables:
air-dry, alai, ally, apply, assai, awry, bahai, barye, belie, bigeye, blackfly, blow-dry, blowfly, bone-dry, bonsai, botfly, breast-high, brunei, buckeye, bye-bye, catchfly, chennai, cockeye, comply, cross-eye, dalai, dayfly, debye, deci-, decry, defy, deny, descry, drip-dry, drive-by, dubai, fishfly, flyby, freeze-dry, gadfly, gallfly, good-by, good-bye, goodby, goodbye, greeneye, greenfly, hereby, hi-fi, horsefly, housefly, imply, july, kadai, kam-tai, kauai, khmer, kichai, knee-high, kowhai, lanai, lay-by, magpie, mayfly, mumbai, nearby, necktie, nilgai, nylghai, outcry, pigsty, pinkeye, plaguy, potpie, rabbi, red-eye, rely, reply, retie, retry, ripply, rough-dry, salai, sandfly, sawfly, sci-fi, scrapie, sesqui-, shadfly, shanghai, shoofly, sinai, sky-high, slant-eye, snakefly, sockeye, songhai, spin-dry, spongefly, spray-dry, standby, stonefly, supply, tent-fly, thereby, untie, versailles, waist-high, walleye, well-nigh, whereby, white-eye, whitefly, wi-fi, wifi

3 syllables:
adonai, aerify, alderfly, alibi, alkali, alumni, amplify, annuli, assegai, aurify, basify, beautify, butterfly, by-and-by, caddicefly, caddisfly, calcify, calculi, carnify, certify, chagatai, chalcidfly, chigetai, chondrify, citify, clarify, classify, codify, crucify, csi, cumuli, damnify, damselfly, dandify, deify, dignify, dobsonfly, dragonfly, dui, dulcify, dziggetai, edify, falsify, fbi, firefly, fortify, frenchify, fructify, fyi, gemini, gentrify, glorify, goggle-eye, goldeneye, gramarye, gratify, hokusai, horrify, impulse-buy, jellify, justify, lanternfly, lenify, lignify, liquefy, liquify, lorelei, lullaby, magnify, metrify, mid-july, minify, misapply, modify, mollify, molokai, mordecai, mortify, multiply, mummify, mystify, nazify, nigrify, nitrify, notify, nuclei, nullify, nutrify, occupy, osmanli, ossify, overbuy, overfly, pacify, passer-by, petrify, pinkify, preachify, prettify, purify, qualify, quantify, radii, ramify, rarify, ratify, rectify, reify, rubify, russify, salify, salsify, samurai, satisfy, scarify, scorify, sensify, signify, simplify, specify, speechify, stimuli, stratify, stultify, stupify, styli, termini, terrify, testify, thurify, typify, uglify, underlie, unify, uruguay, verbify, verify, versify, vilify, vinify, vitrify, vivify

4 syllables:
acetify, acidify, alkalify, alveoli, ammonify, antalkali, antinomy, beatify, complexify, decalcify, decertify, declassify, demulsify, demystify, denazify, denitrify, detoxify, devitrify, disqualify, dissatisfy, disunify, diversify, electrify, emulsify, esterify, etherify, exemplify, fasciculi, gravimetry, havasupai, humidify, identify, indemnify, intensify, lapidify, limicolae, musaceae, oversupply, personify, preoccupy, presignify, reclassify, reunify, revivify, rigidify, saccharify, saponify, selachii, silicify, solidify, syllabify, transmogrify

5 syllables:
caravanserai, chrysophyceae, cupressaceae, discocephali, dwi, ephedraceae, geglossaceae, interstratify, loasaceae, mayacaceae, misidentify, myxophyceae, oversimplify, phaeophyceae, rhodophyceae, schizophyceae, smilacaceae, styracaceae

6 syllables:
ascidiaceae, cyanophyceae, davalliaceae, elasmobranchii, euglenophyceae, geoglossaceae, menispermaceae, oleandraceae, papaveraceae, saururaceae

7 syllables:
diatomophyceae, lepidodendraceae, ophioglossaceae, zannichelliaceae