Coalescing rhymes with:
blaesing, blessing, lessing, acquiescing, addressing, assessing, blaesing, blessing, caressing, compressing, confessing, depressing, digressing, distressing, dressing, expressing, guessing, hessing, impressing, lessing, messing, obsessing, oppressing, possessing, pressing, professing, progressing, reassessing, recessing, redressing, repressing, stressing, suppressing, transgressing
Coalescing sounds like:
calgene's, calkins, callousness, caulking, caulkins, chalking, clackamas, clashing, classing, clausing, clicking, cloaking, clocking, clogging, closeness, closing, closings, clucking, coalescence, collegians, collisions