Nack rhymes with:
knack, knick-knack, nacke, schnack, snack, aback, ack, adak, akc, attack, back, backe, bak, bakke, beaulac, black, brac, brack, brakke, braque, cac, caq, chirac, clack, crack, dac, dack, dak, dulac, fac, flack, flak, hack, hacke, haq, haque, jac, jack, knack, knick-knack, krack, kracke, kwak, lac, lack, lak, mac, mack, macke, mak, nacke, pac, pack, pak, paque, plack, placke, plaque, post-attack, ptak, quack, rack, rak, repack, sac, sack, sak, schack, schlack, schnack, schrack, shack, shaq, slack, smack, snack, spack, spak, stac, stack, strack, stracke, tac, tack, tacke, tak, trac, track, trak, unpack, vanvlack, wack, whack, wrack, yack, yak, zach, zack, zak
Nack sounds like:
n's, n.'s, n.s, naas, nacchio, nacco, nace, nacho, nachos, 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, nixes, 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