Polarity rhymes with:
celerity, clarity, hilarity, irregularity, popularity, regularity, similarity, celerity, clarity, dexterity, disparity, familiarity, geraghty, hilarity, irregularity, parity, peculiarity, popularity, posterity, prosperity, rarity, regularity, similarity, sincerity, solidarity, temerity, unfamiliarity, verity
Polarity sounds like:
palardy, pappalardo, pellerito, pillard, pillared, pilloried, plourde, polaroid, poleward, pollard, popularity