Slab rhymes with:
colab, flab, glab, lab, labbe, ab, bab, babb, cab, colab, crab, crabb, crabbe, dab, drab, fab, flab, gab, glab, grab, grabbe, jab, knab, knabb, krabbe, lab, labbe, mab, macnab, mcnab, mcnabb, nab, nabb, prab, prefab, rab, rabb, sabb, scab, schab, stab, tab, tabb
Slab sounds like:
salafia, saleeby, saliba, salif, saliva, salva, salve, salvi, salvia, salvo, scalf, scallop, scalp, schleif, schlepp, schliep, schlup, schoolboy, schulhauf, schulhof, schulof, schwalb, schwalbe, scialabba, seawolf, selbe, selby, self, selloff, selph, selva, selvey, shelby, shelev, shelf, shelp, shelve, sielaff, sieloff, sigoloff, silva, silvey, silvi, silvia, silvie, silvio, sizelove, slaby, slap, slape, slaphappy, slappey, slav, slava, slave, sleep, sleepy, sleeve, slife, slip, sliva, slob, sloop, slop, slope, sloppy, slovo, sokoloff, sokolov, soloff, soloviev, solvay, solve, sulfa, sylph, sylva, sylvia, sylvie, sylvio