Colab rhymes with:
flab, glab, lab, labbe, slab, ab, bab, babb, cab, 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, slab, stab, tab, tabb
Colab sounds like:
calaf, caleb, calef, calf, calfee, calif, califf, caliph, calliope, calvey, calvi, calvo, celeb, chalabi, chalupa, chelf, cilluffo, cilva, clabo, claffey, clap, clapp, cleave, clef, cleva, cleve, clevie, clif, cliff, cliffe, clip, clive, club, clubb, clubby, cluff, clyve, colby, collopy, colopy, cowslip, cullop, culp, culpa