Nixes rhymes with:
fixes, six's, sixes, wickes's, affixes, alex's, alexs, amax's, amex's, annexes, apex's, appendixes, avtex's, axes, banks's, boomboxes, brooks's, cevaxs, cineplex's, climaxes, coaxes, comex's, cox's, crucifixes, cyrix's, dax's, dynamics's, endotronics's, essex's, exes, faxes, felix's, fixes, flexes, gearboxes, genex's, hoaxes, imax's, index's, indexes, ionics's, isomedix's, jukeboxes, knox's, lynxes, mailboxes, marks's, matchboxes, matrix's, matrixes, max's, metroplexes, miramax's, nynex's, onex's, outfoxes, paradoxes, patlex's, perplexes, phoenix's, relaxes, royex's, sachs's, saks's, six's, sixes, skyboxes, sox's, speakes's, spinks's, surtaxes, syntex's, tax's, taxes', telex's, telmex's, vaxes, waxes, wickes's, x's, x.'s, x.s, xerox's, xeroxes
Nixes sounds like:
n's, n.'s, n.s, naas, nacchio, nacco, nace, nacho, nachos, nack, nacke, nag, nagai, nagao, nagasaki, nagi, nagoya, nags, nagy, nahas, nahmias, naik, naish, nakagawa, nakai, nakao, name's, names, namesake, namesakes, naming, namis, nan's, nance, nancy, nancy's, nanez, nang, nangaku, nankai, nannies, nanninga, nanos, naoki, nasa, nasa's, nasca, nasco, nase, nash, nash's, nashua, nashua's, naso, nass, nassau, naus, nausea, nauseous, nauss, nays, nazi, nazi's, nazis, nazis', neace, neas, nease, nec, necaise, necci, neck, necks, neco, neco's, neece, neeco, nees, neese, neg, negs, negu, negus, neice, neis, neises, neiss, nej, nekia, nekoosa, nemec, nemecek, nemes, nemesis, nemos, neni's, neoax, neonazi, neonazis, neons, nes, nesci, nesi, ness, nessa, nessi, nessie, neuhaus, new-mexico, new-mexico's, newhouse, newish, newman's, newness, news, news', news's, newsies, newsweek, newsweek's, newsy, nex, nexis, nexus, neyens, neysa, nez, ng, ngai, nghi, ngo, ngo's, ngos, nic, nice, niche, niches, nick, nick's, nickey, nicki, nicks, nicky, nicky's, nico, nicosia, nicoski, niece, niece's, nieces, niehaus, niemczyk, niemiec, nienhaus, nienhuis, nies, niese, niess, nigg, nigh, nik, nike, nike's, nikes, niki, nikk's, nikkei, nikkei's, nikkhah, nikki, nikko, nikko's, niko, niko's, nikou, nimmons, nims, ninagawa, nine's, nines, ning, ninja, ninjas, ninos, ninsu, nisei, nishi, nishikawa, nishioka, nishizawa, nissa, nissei, nissho, nix, nixie, nkohse, no's, noack, noah's, noakes, noce, nock, noes, noga, nogawa, noguchi, noise, noises, noisy, nokes, nokia, nokia's, nokyo, nome's, nominee's, nominees, noncash, nonce, nonesuch, nook, nooks, noons, noose, nose, nosek, noses, noska, noss, nosy, nouns, nous, now's, nowack, nowacki, nowaczyk, nowak, nowakowski, nowicki, nowinski, noxious, noxso, noyce, noyes, nuance, nuances, nucci, nuccio, nuexco, nueyung, nuke, nukes, numac, nun's, nuncio, nunes, nunez, nunn's, nuno's, nuns, nuns', nunzio, nuss, nusz, nuys, nuzzi, nuzzo, nyack, nyce, nycz, nyenhuis, nyhus, nymex, nynex, nynex's, nyssa, nyx