I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
gainst canst gainsaid canasta canniest canoeist gooniest keenest gonocyte quinsied
gainst funest liniest luniest keenest renest punniest sanest canoeist finest inset zaniest sunniest dunnest veiniest hygienist phoniest tanist funnest sheeniest tawniest viniest tennist funniest tinniest vainest mooniest unset wannest meanest wenniest onset whinniest piniest finniest nest tannest puniest looniest hymnist leanest runniest rainiest soonest canst gooniest ginniest downiest sunset dynast boniest canniest neist fainest moonset winiest pianist whiniest monist weeniest waniest bonniest fenniest toniest fawniest tiniest honest teeniest shiniest
gains gainsay cains gayness goannas guanase guanays guanos guans guineas kains