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.
hymnist monist mooniest meanest moonset mainstay monazite mensed monacid
hymnist neist puniest monist pianist bonniest fawniest luniest finniest funniest tinniest fenniest tennist waniest tawniest wenniest downiest whinniest sunniest sheeniest rainiest phoniest veiniest tiniest piniest boniest mooniest liniest gooniest looniest hygienist ginniest canniest viniest teeniest toniest tanist weeniest zaniest whiniest runniest winiest punniest shiniest