Complaining rhymes with:
explaining, explaining, laning, abstaining, ascertaining, attaining, campaigning, caning, chaining, constraining, containing, deigning, detaining, disdaining, draining, entertaining, explaining, feigning, gaining, haning, laning, maintaining, obtaining, ordaining, overtraining, pertaining, raining, refraining, regaining, reigning, reining, remaining, restraining, retaining, retraining, staining, straining, sustaining, training, waning
Complaining sounds like:
compelling, compiling, complains, compliance, complying, confluence