Sump 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, thump, trump
Sump sounds like:
samba, sambo, samp, sampey, sanofi, schamp, schempf, schempp, schimpf, schnapp, schnepf, schnepp, schoenhof, seekamp, seneff, senf, senff, shambo, shamp, shampoo, sheshunoff, shimp, signify, simba, skimp, skimpy, smaby, smeby, snafu, snap, snape, snapp, snappy, sniff, sniffy, snip, snipe, snob, snobby, snoop, snoopy, snub, snuff, socanav, sosnoff, succumb, sunobe, sunup, swamp, swampy