Certain rhymes with:
uncertain, berton, blurton, burton, curtain, eatherton, emberton, emerton, etherton, girten, girton, howerton, kirton, leverton, merten, merton, murton, pilkerton, turton, uncertain, urton, wolverton, worton
Certain sounds like:
caradine, caradonna, carden, cardin, cardoen, cardon, cardona, cardone, cardoni, cardoon, carotene, carton, cartoon, ceradyne, ceridian, chardonnay, chretien, cordon, cordone, corradino, corten, cortin, cortina, cortine, courtenay, courtney, craton, crayton, creation, creeden, creedon, cretien, cretin, criton, croatian, crowden, cureton, curtain, curtin, cwiertnia