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.
honest honesty
nest keenest vainest wannest meanest fainest finest honest funnest leanest dunnest soonest tannest renest funest sanest sunset fenniest bonniest gainst lancet puniest boneset rainiest pianist gooniest oncet tiniest tawniest waniest monist runniest looniest finniest tennist unset hygienist dynast wenniest downiest whinniest canst sheeniest sunniest weeniest teeniest luniest ginniest veiniest inset funniest hymnist piniest neist fawniest moonset viniest tinniest boniest liniest phoniest cineast onset honesty punniest canniest toniest canoeist zaniest whiniest tanist winiest mooniest shiniest