1 syllable:
au, aux, beau, beaut, beaux, blow, bo, boe, breaux, bro, by-blow, cho, chough, co, coe, cro, crow, dau, doe, doh, dough, eau, faux, flo, floe, flow, foe, fro, glow, go, gro, grow, ho, hoe, jo, joe, know, ko, koh, lo, low, lowe, luo, mau, mo, moe, mow, nau, no, noe, noh, o, o., oh, ow, owe, po, poe, poh, pro, quo, rho, ro, roe, row, rowe, schmo, sew, show, sloe, slow, snow, so, stow, stowe, tho, though, throe, throw, toe, tow, trow, tso, vo, whoa, wo, woe, yo

2 syllables:
aglow, ago, airglow, aloe, although, ammo, and so, atto-, backflow, backhoe, bandeau, banjo, bateau, below, bestow, big toe, bilbo, billyoh, bio, bongo, bordeaux, borough, borrow, bozo, bread dough, caco-, cargo, cd-wo, chapeau, chateau, cheapo, chico, chondro-, coco, cohoe, combo, compo, corn snow, crossbow, dado, day-glo, deathblow, diploe, dobro, dog show, dry-rot, dumb show, dunno, dutch hoe, ebro, elbow, emo, escrow, fallow, fargo, farrow, felloe, flambeau, floorshow, floor show, flyblow, fogbow, footfault, forego, foreshow, forgo, foucault, free throw, frost snow, fuego, game show, gateau, get-go, gingko, ginkgo, gizmo, glasgow, go-go, golf pro, great toe, grotto, group o, guangzhou, guano, gung-ho, gusto, gyro, handbow, hangzhou, hard roe, heigh-ho, hello, hollo, hoosgow, horseshow, hwang ho, hydro, hypno, ice floe, ice show, ido, inflow, i know, jambeau, jim crow, jingo, joe blow, john doe, judo, just so, kayo, kilo, kowtow, laid low, lanzhou, let go, levo-, lie low, ling ko, longbow, lotto, lowbrow, lucknow, ludlow, ludo, mahoe, make grow, manteau, marlowe, meadow, memo, merlot, metro, micro, micro-, miro, monroe, moo-cow, morceau, moro, moscow, mudflow, munro, necro, necro-, nephro, neuro, neuro-, news show, ngo, no-fault, no-go, no-show, nouveau, octo-, ortho, or so, otto, outflow, outgo, outgrow, oxbow, panto-, peepshow, pequot, pernod, perot, petro-, photo, photo-, pico-, pinto, plateau, pneumo-, pogo, presto, primo, promo, proto-, puerto, punto, quito, rainbow, rhino, rhino-, rialto, road show, rondeau, rope tow, rouleau, rousseau, run low, sarco-, sclero, sclero-, sego, sesno, shadblow, shadow, shad roe, shinto, sideshow, skid row, ski tow, so-so, soft roe, solo, sorgho, stretto, strip show, tableau, talk show, tarlow, tarot, tasso, tempo, thoreau, tiptoe, toetoe, toe toe, tong ho, tonneau, torso, to know, trio, trousseau, trudeau, trumeau, turbot, type o, udo, uh-oh, uno, upthrow, van gogh, ventro-, veto, whitlow, willow, winnow, woodrow, workflow, xantho, yobbo, you know

3 syllables:
aerugo, afterglow, akimbo, albino, aliquot, allegro, alpenglow, amigo, angelo, aniso-, anthropo, anthropo-, antido, apropos, audio, bay willow, billy-ho, black willow, blow-by-blow, bordello, bordereau, borneo, buffalo, bungalow, bush willow, c. b. o., c. e. o., calico, calypso, cameo, cape aloe, centavo, centimo, ceo, cfo, chicago, cicero, commando, counterblow, counterglow, crack willow, diazo, domino, dwarf willow, dynamo, eeo, embryo, eskimo, espresso, even so, ever so, ex-voto, falsetto, fandango, farrago, figaro, flamenco, fontainebleau, foreknow, fricandeau, fugato, g. a. o., give-and-go, goat willow, golden glow, gray willow, guanaco, h. b. o., h. m. o., hammertoe, hammer throw, hemp willow, hidalgo, hirundo, holy joe, idaho, indigo, interflow, iodo-, i don't know, james monroe, janeiro, jericho, kosovo, lanugo, legato, let it go, leucothoe, little joe, little toe, long ago, lumbago, medico, mexico, minstrel show, mirabeau, mistletoe, monaco, navajo, nemato, nemato-, oleo, osteo, osteo-, overblow, overflow, overthrow, p. l. o., pahoehoe, pamlico, pampero, paseo, pastry dough, patio, picaro, piccolo, picture show, pimlico, piping crow, plumbago, pokomo, polio, pompano, portico, portmanteau, potato, po box no, proximo, puppet show, quid pro quo, radio, radio-, raree-show, rate of flow, ratio, red bordeaux, red willow, risotto, rococo, rodeo, romano, romeo, saddlebow, sage willow, scorpio, scuffle hoe, sentry go, shadow show, shavuot, sillago, sloppy joe, snap willow, socio-, sourdough, spermato-, staccato, status quo, stereo, stereo-, streamline flow, studio, swamp willow, tae kwon do, tallyho, tennis pro, tidal flow, tobacco, tokyo, tomato, tomorrow, tornado, torpedo, touch-and-go, tourtelot, to and fro, tuckahoe, tupelo, tv show, u. f. o., ufo, ultimo, underflow, undergo, undergrow, undertow, unesco, vertigo, virago, white willow, zydeco

4 syllables:
adagio, air potato, almond willow, altiplano, altissimo, animato, arapaho, arapahoe, arctic willow, balsam willow, basket willow, black buffalo, brittle willow, callirhoe, cape buffalo, carrion crow, centesimo, charity throw, clock radio, creeping willow, desert willow, dwarf buffalo, dwarf gray willow, electric glow, false indigo, false mistletoe, from head to toe, gallinago, genus aloe, geronimo, get-up-and-go, golden willow, guantanamo, hirohito, hoary willow, hot potato, husk tomato, in embryo, jean-jacques rousseau, laminar flow, laurel willow, loss ratio, manifesto, medicago, menstrual flow, moustachio, mustachio, new mexico, north borneo, oregano, ostinato, pistachio, plum tomato, pocket borough, politico, portfolio, prairie willow, presidio, purple willow, pussy willow, rotten borough, shining willow, silky willow, silver willow, sitka willow, solidago, stuffed tomato, sweet potato, tennis elbow, tree tobacco, tree tomato, tupungato, turbulent flow, vincent van gogh, weeping willow, white potato, wild indigo, wild potato, wild tobacco

5 syllables:
aficionado, american crow, archipelago, arroyo willow, aspect ratio, bastard indigo, blue false indigo, braggadocio, cherry tomato, cold stuffed tomato, common tobacco, cumberland plateau, desire to know, divertimento, duodecimo, esperantido, focal ratio, genus calypso, gulf of mexico, homing torpedo, hot stuffed tomato, human dynamo, huntingdon willow, impresario, irish potato, jasmine tobacco, ladies' tobacco, lady's tobacco, little potato, michelangelo, montevideo, octodecimo, old world buffalo, old world mistletoe, penalty free throw, pianissimo, roll of tobacco, rose of jericho, sextodecimo, television show, turkish tobacco, variety show, w. t. o., water buffalo, white false indigo

6 syllables:
a. f. l. c. i. o., aerial torpedo, american aloe, anisette de bordeaux, bangalore torpedo, broadcasting studio, florida pompano, flowering tobacco, generalissimo, henry david thoreau, indian buffalo, indian potato, indian tobacco, low archipelago, recording studio, rio de janeiro, since a long time ago, strawberry tomato, submarine torpedo, uruguay potato

7 syllables:
american buffalo, american mistletoe, bismarck archipelago, california pompano, capital of idaho, capital of mexico, indonesian borneo, malay archipelago, mexican husk tomato, signal-to-noise ratio, wisconsin weeping willow, yellow dwarf of potato

8 syllables:
capital of new mexico, japanese archipelago, marcus tullius cicero

9 syllables:
babylonian weeping willow