Opt rhymes with:
adopt, chopped, co-opt, copped, cropped, dropped, flopped, hopped, lopped, mopped, plopped, popped, propped, shopped, stopped, swapped, topped
Opt sounds like:
obadiah, obeid, obeyed, obit, obviate, obviated, offbeat, offutt, oft, opiate, opted, opto, ovate, ovett, oviatt, oviedo, ovitt, ovoid