Operan rhymes with:
amparan, aldebaran, amparan, anaren, andren, askren, bargeron, bundren, cameron, catherine, coldren, condren, corcoran, cothren, fondren, halloran, hefferan, hefferon, hendren, holdren, holleran, holloran, killoran, lutheran, mandarin, margarine, milliron, motoren, nitroglycerin, nitroglycerine, o'hallaron, o'halloran, o'halloron, ohalloran, orgeron, pickren, saccharin, saharan, tamarin, tiberon, uterine, veteran, voltaren
Operan sounds like:
o'beirne, o'brian, o'brien, o'bryan, o'byrne, obeirne, oberman, oberon, obrian, obrien, obryan, obyrne, offerman, offermann, opperman, oppermann, ovarian, overman, overran, overrun