Nihon rhymes with:
dehaan, hourihan, johann, kohan, mohan, wojahn, adlon, aegon, aequitron, agouron, aharon, aidan, albritton, algernon, allbritton, alliston, altron, ameron, amidon, anasquan, anyon, astrakhan, aubuchon, audubon, avedon, avodon, avon, axlon, baylon, betavon, bhagwan, bisaillon, bohannon, bohanon, bordelon, bouchillon, boyan, calderon, carlyon, carlzon, castanon, castellon, castillon, castrejon, celeron, certron, chemetron, chlorofluorocarbon, circon, claridon, coldiron, congleton, connaughton, creviston, crunkleton, culleton, cyclotron, dehaan, deion, deniston, denniston, deon, dione, dionne, donilon, dunagan, eccleston, eddlemon, edmiston, eggleton, egleston, electron, elektron, elliston, embleton, enron, enzon, equion, eron, esteban, estefan, exxon, fincannon, freon, fudosan, futon, gahagan, galyon, geon, gian, grammophon, grandon, hambleton, hanagan, hardimon, heptathlon, hollomon, hourihan, humiston, hunan, icahn, icon, ikon, integon, interferon, invitron, ireton, iwan, johann, joulwan, juwan, katayan, kayvon, keniston, khazakhstan, kikkoman, kohan, krypton, lebreton, leon, luzon, magallon, magowan, maranon, matewan, maxion, michcon, milacron, mohan, moleculon, morejon, moreton, narayan, negatron, neon, nephron, nissan, nunan, o'hagan, orelon, ormiston, oxymoron, pembleton, peniston, perignon, pettijohn, phototron, pingleton, pitswon, poppleton, prebon, pusan, python, ragunathan, raison, raytheon, regwan, revlon, rostovondon, saison, sauvignon, sczechuan, sethuraman, shiyuan, solitron, stefan, tampon, tebuthiuron, tejon, telectron, telethon, telxon, tevatron, textron, theone, ticketron, torrejon, transcon, vaneaton, vernitron, vitramon, vuncannon, wilemon, williston, wilpon, wobegon, wojahn, xenon
Nihon sounds like:
n, n., n92762, na, nah, nahm, nahum, naim, naiman, nam, name, nan, nana, nania, nanna, nanney, nanni, nannini, nanny, nano, naoma, naomi, nau, nauman, naumann, naw, nay, ne, nee, neeman, neenan, nehemiah, neiman, nein, nemean, nemo, nene, neni, neo, neoma, neon, neu, neue, neuman, neumann, new, newey, newman, newmann, newnam, ney, neyman, ni, nie, nieman, niemann, niemi, nienow, nihay, nihei, niihau, nimmo, nimoy, nina, nine, ninneman, ninny, nino, ninon, no, noa, noaa, noah, noam, noami, noe, noh, noiman, nom, nome, nomi, nominee, nomo, non, nona, none, nonhuman, nonie, nonunion, noon, noonan, noone, nooney, noun, now, nowa, nu, nuhn, numia, nummi, nun, nunan, nunn, nuno, nye, nyhan, nyina, nyman