Thumbs rhymes with:
becomes, bums, chums, comes, crumbs, drums, gumbs, gums, gumz, hums, mums, plum's, plums, rums, slums, somes, strums, succumbs, sums, tums, tums'
Thumbs sounds like:
tambs, tampa's, tampax, tamposi, tamps, tempos, temps, tenpas, thumps, timbs, timepiece, tombs, toombs, tunafish