Cottonwood rhymes with:
allenwood, ellenwood, allenwood, bournewood, ellenwood, ellinwood, fenwood, glenwood, greenwood, henwood, inwood, ironwood, kenwood, linwood, stanwood, winwood
Cottonwood sounds like:
cadenhead, castaneda, catamount, cautioned, chastened, chestnut, chestnutt, costumed, cottoned, cottonmouth, coutant