Thump rhymes with:
bump, chump, clump, crump, dump, frump, grump, gump, gumpp, hump, jump, klump, klumpp, kump, lump, lumpp, plump, pump, rump, slump, stump, stumpe, stumpp, sump, trump
Thump sounds like:
tambo, tamp, tampa, tampopo, tanabe, temp, tempe, tempo, thomp, thumb, tien-fu, timpe, tomb, tomboy, tuneup