Coalescence rhymes with:
adolescence, convalescence, obsolescence, adolescence, convalescence, obsolescence, acquiescence, adolescence, convalescence, essence, evanescence, luminescence, obsolescence, phosphorescence, quintessence, senescence
Coalescence sounds like:
calgene's, calkins, callousness, caulking, caulkins, chalking, clackamas, clashing, classing, clausing, clicking, cloaking, clocking, clogging, closeness, closing, closings, clucking, coalescing, collegians, collisions