ow の 読みかた には わかりやすい ルールは ないので、学習上 とても まぎらわしく、混乱の もと です。
/aU/「アウ」:allow, blowsy/blowzy, bowel, brow, brown, chow, chowder, clown, cow, crowd, crown, dow, down, drown, drowsy, endow, eyebrow, flower, fowl, frown, gown, hoosegow, how, howl, kowtow, now, owl, plow, pow, power, prow, renown, rowdy, scow, shower, sow (pig), towel, tower, town, vow, vowel, wow, yow, etc.
/oU/「オウ」:arrow, bellow, below, bestow, blow, borrow, bowl, bungalow, crow, elbow, escrow, fellow, flow, follow, glow, grow, hollow, know, longbow, low, lower, marrow, mellow, narrow, own, owner, pillow, rainbow, shadow, shallow, show, slow, snow, sorrow, sparrow, stow, swallow, throw, tomorrow, tow, widow, window, yellow, etc.
両方:bow, Moscow, mow, row, rowan, sow
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