Proton rhymes with:
photon, arton, automaton, chapoton, germiston, mahtan, photon, saamstaan, agamemnon, aileron, alarcon, albashaun, amazon, antiphon, aragon, arbitron, argon, argonne, arton, autobahn, autobon, automaton, avalon, axon, babylon, betaseron, boron, capon, carillon, catchacan, celadon, cephalon, chapoton, christiaan, cimarron, comecon, crayon, d'aubuisson, dacron, digicon, dijon, distron, echelon, econ, emoticon, epsilon, erawan, ethicon, farrakhan, fenelon, germiston, greenspon, guslan, halon, hardymon, helicon, hexagon, hogan, huron, infotron, lexicon, liaison, lifson, littlejohn, logicon, magnetron, mahtan, marathon, memnon, meson, micron, midcon, monoszon, moron, narasimhan, neutron, nikon, nipon, nylon, oberon, octagon, oerlikon, olajuwon, oxdon, pantheon, paragon, parmesan, parthenon, pentagon, phenomenon, photon, pi-meson, pion, planecon, polygon, polysilicon, pompon, positron, pylon, qian, radon, radovan, ragavan, reveron, saamstaan, semicon, shihan, simion, siobhan, sirhan, slip-on, slobodan, symtron, technicon, telefon, teletron, tucson, upjohn, vanderlaan, videotron, walk-on, waylon, yukon
Proton sounds like:
paradyne, parden, pardini, pardon, part-time, partain, parten, parthenia, parthenon, parthian, partin, partition, partney, parton, parttime, partum, pepperdine, perdomo, perrodin, pertain, pertamina, portadown, portion, portman, portney, portnoy, predation, predawn, preordain, preteen, prettyman, proration, protean, protein, protium, pruden, prudhomme, purdham, purdin, purdom, purdon, purdum, puritan