Irradiate rhymes with:
mediate, repudiate, abbreviate, affiliate, alleviate, appreciate, asphyxiate, delineate, depreciate, deviate, differentiate, emaciate, enunciate, excoriate, expatriate, expiate, expropriate, foliate, glaciate, herniate, humiliate, inebriate, infuriate, ingratiate, initiate, instantiate, mediate, misappropriate, nauseate, negotiate, obviate, officiate, permeate, recreate, renegotiate, renunciate, repatriate, repudiate, retaliate, substantiate, unaffiliate
Irradiate sounds like:
ierardi, irate, ireta, iretta, irette, irit, irradiated, irrawaddy, irritate, irritated