Seventy's rhymes with:
seventies, seventies, seventies, certainties, seventies, uncertainties, warranties, antes, bounties, bracamonte's, bracamontes, bronte's, buonicontis, certainties, counties, county's, dante's, monte's, montes, mounties, nineties, nineties', ninety's, panties, seventies, shanties, twenties, twenty's, uncertainties, vigilantes, warranties
Seventy's sounds like:
savants, sevenths, seventies, shipmates, shipments, sifuentes, spandex, spends, submits, suspends, sycophantic