Retraining rhymes with:
constraining, overtraining, restraining, straining, training, constraining, draining, overtraining, raining, refraining, reigning, reining, restraining, straining, training
Retraining sounds like:
red-herring, red-herrings, redrawing, reordering, retiring, retrench, retrying, returnees, returning, returns, returns'