Clump rhymes with:
klump, klumpp, klump, klumpp, lump, lumpp, plump, slump, bump, chump, crump, dump, frump, grump, gump, gumpp, hump, jump, klump, klumpp, kump, lump, lumpp, plump, pump, rump, slump, stump, stumpe, stumpp, sump, thump, trump
Clump sounds like:
clamp, cleanup, climb, clumpy, collomb, colomb, colombe, colombia, colombo, columba, columbia, columbo, coulombe, culinova