Thum rhymes with:
thumb, thumm, ancrum, baucum, become, bluhm, boyum, brum, brumm, bum, chum, clum, come, crum, crumb, crumm, cum, drum, drumm, dum, dumb, dumm, exum, from, frum, glum, grum, gum, gumm, hmmm, hohum, hum, humm, klumb, krum, krumm, krumme, kumm, lum, lumb, lumm, maam, mccrum, mccrumb, mum, mumm, mumme, narum, numb, pflum, plum, plumb, rum, schrum, schum, schumm, scum, sharum, shrum, shum, slum, some, strum, stum, stumm, succumb, sum, swum, thumb, thumm, um, umm, yum
Thum sounds like:
taima, taiwan, tam, tama, tamanaha, tamayo, tame, tami, tamiami, tamm, tammany, tammen, tammie, tammo, tammy, tan, tanen, taney, tani, tania, tann, tannen, tanney, tanu, tanya, tatem, tatham, tatiana, tatman, tatom, tatum, tatyana, tawana, tawney, tawny, tayman, teahan, team, teaney, tedium, tedman, teehan, teem, teen, teena, teenie, teeny, tehan, temme, ten, tena, tenn, tenney, tenny, teton, thaden, thain, thaine, tham, than, thane, thanh, thano, thayne, theano, thein, them, theme, then, theon, theone, thiamin, thiem, thieman, thiemann, thieme, thien, thima, thin, thine, thoen, thoene, thom, thoma, thoman, thomann, thome, thommen, thon, thone, thuma, thuman, thumann, thumm, thumma, thun, thune, thyme, tian, tiananmen, tiano, tiedeman, tiedemann, tiein, tieman, tiemann, tien, tienanmen, tim, timan, time, timm, timme, timmeny, timmie, timmy, timon, timoney, tin, tina, tine, tinman, tinney, tinnin, tinnon, tinny, tino, tiny, titan, titania, titanium, titian, titman, titone, todman, tom, toma, tomaino, toman, tome, tomei, tomeo, tomey, tommie, tommy, ton, tone, toney, toni, tonia, tonie, tonini, tonn, tonne, tony, tonya, tooman, toomey, toon, toone, toothman, totem, totman, totten, tottenham, totton, town, towne, townie, toyama, tuhan, tuition, tuma, tuman, tumey, tummy, tuna, tune, tunney, tunny, tuomi, tuten, tutino, tutton, twain, tweten, twin, twine, twomey, twyman, tynan, tyne