Proton's rhymes with:
protons, protons, photons, protons, germiston's, photons, protons, agamemnon's, ailerons, amazon's, amazons, antiphons, avalon's, axons, crayons, deuterons, echelons, farrakhan's, germiston's, helicons, hogan's, hogans, icons, infotron's, lexicons, liaisons, lifson's, lubicons, marathons, mesons, micron's, microns, neons, neutrons, nylons, olajuwon's, pentagon's, pentagons, photons, pompons, positrons, protons, pylons, ragavan's, reveron's, slip-ons, upjohn's, walk-ons
Proton's sounds like:
parading, paradyne's, pardoning, pardons, parting, partitioning, partitions, partying, pertaining, pertains, pirating, porting, portions, predominance, preteens, pretense, pretenses, prodding, protein's, proteinaceous, proteins, protons, prudence, prudency, puritans