Rarity rhymes with:
celerity, clarity, dexterity, disparity, familiarity, geraghty, hilarity, irregularity, parity, peculiarity, polarity, popularity, posterity, prosperity, regularity, similarity, sincerity, solidarity, temerity, unfamiliarity, verity
Rarity sounds like:
raad, rad, rada, radde, radha, radi, radiate, radiated, radio, radioed, rado, radu, rady, raid, raided, rait, raith, raitt, rat, rat-a-tat, rata, ratay, rate, rated, rath, rathe, ratio, ratte, ratty, ratu, raut, rauth, rautio, rawhide, rayed, read, reade, readied, readout, ready, reared, reatta, red, red-eye, reda, redd, redditt, reddy, redeye, redhead, redheaded, redi, redid, redo, redwood, reed, reedy, rehired, reid, reidt, reidy, reit, reith, reread, reroute, rerouted, ret, reta, reti, reto, rettew, reward, rewarded, rewired, reword, rewrite, rewrote, rheta, rhett, rhoad, rhoda, rhode, rhodia, rhody, rhoto, rhude, rhudy, riad, riady, rid, ride, rideau, rideout, ridout, ried, riede, riedy, rieth, riot, rioted, rita, rite, ritt, riyad, riyadh, road, roadie, roadway, roady, roared, roarty, roat, roath, rod, roda, rodd, roddey, roddie, roddy, rode, rodeo, rodeway, rodi, rody, roed, rohde, rood, roode, roorda, root, rooted, rot, rota, rotate, rotated, rote, rotea, roth, rothe, roti, roto, rott, rotted, rout, route, routed, routh, routt, rowdy, rowed, royd, rrrot, rud, ruda, rudd, ruddy, rude, rudi, rudie, rudow, rudy, rueda, ruedy, rueth, rut, ruta, ruth, ruthie, rutt, rutted, ruud