1 syllable:
aue, bao, blau, blauw, blough, bough, brau, brough, brow, cao, cau, chao, chiao, chow, ciao, clough, cow, crough, dao, daopao, dow, dowe, drough, fao, frau, gnau, gow, grau, graue, hao, hau, hmpao, how, howe, hsiao, jwoww, kao, kau, klaue, kough, lao, lau, lmmfao, lough, mao, now, pao, pfau, plough, plow, pough, pow, powe, prough, prow, rao, rau, sao, schlau, schlough, schow, scow, shao, shough, shrow, skow, sough, sow, sprow, strau, strough, tao, thao, thau, thou, tpe wau, tsao, vdpau, vow, wow, xiao, yao, yow, zhao, zschau

2 syllables:
aarau, al-fao, allow, and how, ant cow, arau, aschgrau, avow, bacau, bandow, bilbao, bow-wow, bowwow, brandow, breastplough, cabiao, cacau, cahow, carwow, cash cow, cat chow, changdao, cheng xiao, chingtao, chow chow, cibao, cocao, dadao, depauw, dessau, devow, endow, eyebrow, feldgrau, fernao, filyaw, first cow, foclmao, fuyao, guandao, hausfrau, highbrow, hofbrau, i-thou, jarchow, jungfrau, just now, kapow, know-how, kowtow, kuntao, lanao, landau, latiao, lessnau, liao, lichtblau, ling-pao, locao, luau, lubao, macao, macau, maicao, mandaue, maomao, margao, mcdow, mcgough, meow, miaodao, mike howe, milch cow, milk cow, monschau, nandao, nanzhao, ndau, neelghau, nylghau, ogowe, outbow, pathao, pegao, pingyao, podao, pow-wow, powwow, pudao, purewow, qiao, qingdao, qipao, right now, rizhao, roflmao, rotflmao, rotglmao, sadao, safflow, sea cow, serowe, sestao, shen-pao, shimao, shitao, shou-lao, simao, snowplough, snowplow, somehow, sorkow, speak now, taobao, tian tao, tien-pao, til now, todd-ao, tsingtao, tumbao, turnbough, unbow, unnao, warehou, wodao, wow-wow, xinyao, yarbough, youdao

3 syllables:
ahegao, amy chow, andrew howe, anyhow, apayao, atyrau, bajaao, barbakow, bella ciao, cabuyao, cacajao, cainiao, carabao, cedeao, changpeng zhao, conceicao, curaao, curacao, dairy cow, dazibao, disallow, disavow, disavow', ehefrau, eigengrau, geforce now, gong lijiao, goodenough, guilinggao, here and now, he bingjiao, hongyipao, huang zitao, huludao, humacao, ifugao, initao, jiandao, kabeljauw, krakatao, liang chow, lister plough, lister plow, liuyedao, mahilyow, maranhao, miagao, middlebrow, mindanao, morgenthau, overcrow, pathet-lao, puppy chow, qinhuangdao, rowdydow, sacred cow, schering-plough, shaohao, shi tingmao, sillyhow, siopao, springing cow, tamarao, tongliao, toutiao, until now, up to now, wikihow, xiantiandao, xiaolongbao, yanmaodao, yaorenmao, yiguandao, youtiao, zhanmadao, zhenniao

4 syllables:
anhalt-dessau, charlotte nicdao, john allen chau, kitaotao, lmfao, maguindanao, manny pacquiao, marianao, martin landau, maschinenbau

5 syllables:
athletic bilbao, caniapiscau, coco de macao, holier-than-thou