Seventies rhymes with:
seventy's, seventy's, seventy's, certainties, seventy's, 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, seventy's, shanties, twenties, twenty's, uncertainties, vigilantes, warranties
Seventies sounds like:
savants, sevenths, seventy's, shipmates, shipments, sifuentes, spandex, spends, submits, suspends, sycophantic