Purest rhymes with:
jurist, tourist, aquarist, armbrust, barest, buttressed, dearest, deforest, direst, embarrassed, florist, forest, forrest, guitarist, interest, jurist, laforest, merest, nearest, noninterest, pendergrast, psychiatrist, rainforest, rarest, reforest, severest, terraced, tourist
Purest sounds like:
paperweight, parachute, parachuted, parakeet, parasite, parched, parked, parkside, parquet, parsed, perched, perished, perked, peroxide, perquisite, persaud, persecute, persecuted, perset, persist, persisted, persuade, persuaded, perused, phrased, pierced, poorest, pracht, praised, prasad, preached, precast, precede, preceded, preceed, precht, preciado, precooked, preexist, preexisted, prerequisite, presaged, prescot, prescott, preset, preside, presided, presidio, pressed, presswood, prest, presta, presti, prestia, presto, prestwood, presutti, preyista, priced, prichett, priciest, pricked, prickett, priest, priesthood, prized, proceed, proceeded, processed, procida, procyte, project, projected, prosecute, prosecuted, prosody, prost, prostate, prostitute, proust, prust, purchased, purged, purist, pursed, pursued, pursueth, pursuit