Substantiates rhymes with:
abbreviates, affiliate's, appreciates, appropriates, asphyxiates, delineates, depreciates, deviates, differentiates, emaciates, expatriates, herniates, humiliates, inebriates, infuriates, instantiates, misappropriates, negotiates, obviates, officiates, permeates, radiates, recreates, repudiates