Co-opt rhymes with:
adopt, chopped, copped, cropped, dropped, flopped, hopped, lopped, mopped, opt, plopped, popped, propped, shopped, stopped, swapped, topped
Co-opt sounds like:
cabot, caped, capita, capito, capote, capped, cappetta, caput, caputi, caputo, cavataio, caveat, caved, cavett, cavitt, cavity, cepeda, chabot, chafed, chafete, chaput, chevette, cheviot, chiappetta, chiavetta, chipita, chipote, chipped, chopped, civet, co-opted, cobbett, cockpit, cofide, cohabit, coiffed, cooped, coped, copied, copped, covatta, covet, coveted, cubed, cubit, cuffed, cupid, cupidity, cupit, cuppett