Riffing rhymes with:
griffing, griffing, sniffing, spiffing, beefing, bluffing, briefing, chafing, choreographing, coffing, coughing, debriefing, doffing, dwarfing, engulfing, fireproofing, golfing, goofing, griffing, handcuffing, huffing, knifing, laughing, leafing, morphing, offing, photographing, proofing, puffing, rebuffing, rohlfing, roofing, roughing, ruffing, rustproofing, safing, sniffing, snuffing, spiffing, spoofing, staffing, strafing, stuffing, surfing, waterproofing
Riffing sounds like:
rabin's, rabobank, raping, rappahannock, rapping, ravenous, ravens, ravin's, ravines, raving, ravinous, ravinus, reaping, rebuffing, refenes, refinance, refinances, refines, refining, refinish, reopening, reopens, repaying, repinski, reponse, revenge, revenues, reviewing, reviving, revving, ribbing, ribbons, ripening, ripping, robbing, robbins, robin's, robins, robins', robins's, roofing, roping, roving, rovings, rubbing, rubens, rubin's, ruffing, rybinski