Tenacity rhymes with:
cassetty, cassity, mendacity, veracity, adversity, authenticity, cassetty, cassity, duplicity, ethnicity, mendacity, multiplicity, nicety, pomposity, propensity, reciprocity, scarcity, synchronicity, varsity, veracity, virtuosity
Tenacity sounds like:
tanked, tannest, teenaged, thanked, thinnest, tinged, tiniest, tomasetti, tomassetti, tomcat, tongued, toniest, tonight, tungate, tunicate, twinjet