Oppens rhymes with:
coppens, aspen's, aspens, cheapens, coppens, deepens, happens, lippens, opens, pippen's, reopens, saipan's, sharpens, tippens, weapon's, weapons, weapons', yaupons
Oppens sounds like:
obeying, obnoxious, offense, offenses, offing, opening, openings, openness, opens, openshaw, opines, opining, opinions, ovens, ovonic