Ninety's rhymes with:
nineties, nineties', nineties, nineties', antes, bounties, bracamonte's, bracamontes, bronte's, buonicontis, certainties, counties, county's, dante's, monte's, montes, mounties, nineties, nineties', panties, seventies, seventy's, shanties, twenties, twenty's, uncertainties, vigilantes, warranties
Ninety's sounds like:
nadgwick, nadja, nantes, nantz, natasha, natasha's, natchez, natchez', natchez's, natec's, natick, nato's, nats, natsios, natzke, nautica, ned's, neddick, needs, neidigh, neitz, neitzke, nematodes, nemetz, nemitz, nendick, nets, netz, newedge, newmont's, newt's, newts, niedzwiecki, nieto's, nietzsche, nimitz, nimtz, nineties, nineties', ninths, nitka, nitsa, nitsch, nitsche, nitschke, nitz, nitza, nitza's, nitze, nitzsche, nodes, nods, nomad's, nomadic, nomads, nominates, nontoxic, nonwhites, notch, notches, note's, notes, notes', notice, notices, notis, nots, nottage, notz, nowadays, nudes, nudge, nudges, nut's, nuts