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.
honesty honest
honesty nest finest finniest funest funnest funniest phoniest fenniest fawniest canniest keenest liniest luniest meanest rainiest puniest runniest sanest sunniest density dunnest tannest teeniest tiniest toniest wannest wenniest whinniest sheeniest hyponasty vainest nasty punniest boniest boneset neist veiniest honest fainest bonniest viniest ginniest gooniest leanest looniest mainstay piniest mooniest renest cineast soonest zaniest downiest dynasty tawniest tensity tinniest waniest weeniest whiniest winiest shiniest