Premature rhymes with:
mature, mature, mature, allure, amanpour, assure, badour, baldur, beladur, bijur, bloor, bonjour, boor, brochure, buhr, cour, couture, cure, damour, demure, detour, duerr, dufour, endure, ensure, foor, fuhr, gilmour, gloor, gochnour, immature, impure, insure, inure, jabbour, jure, lacour, lancour, latour, lesure, lumpur, lure, manure, mature, moor, moore, mosur, muhr, muir, nur, obscure, observateur, pimplapure, poor, poore, procure, pure, reassure, rednour, reinsure, ruhr, schnoor, schuur, secure, segur, shure, spoor, stamour, suhr, suhre, suire, sure, tour, ture, uhr, unsure, you're
Premature sounds like:
parameter, parmenter, parmentier, parmeter, perimeter, permenter, premonitory, printer, promoter