Substantiate rhymes with:
abbreviate, affiliate, alleviate, appreciate, asphyxiate, delineate, depreciate, deviate, differentiate, emaciate, enunciate, excoriate, expatriate, expiate, expropriate, foliate, glaciate, herniate, humiliate, inebriate, infuriate, ingratiate, initiate, instantiate, irradiate, mediate, misappropriate, nauseate, negotiate, obviate, officiate, permeate, recreate, renegotiate, renunciate, repatriate, repudiate, retaliate, unaffiliate