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.
cuesta costa quest guest costae casita coesite cassata gust cost cast coset caste coast gusty gusto cosset cussed caused gusset keyset caseate casette gooiest guessed cassette
fiesta siesta cuesta cesta vesta testa hygeist pesto feist feast testy rest reset gest gooiest hosta casita mozetta quest neist cassata west zooiest shiest chest weest testae test doest zest stay cesti staw setae vest seta heist nest pesty jest reest hest east fest beast hygieist zeta guest geste costa pasta best wriest peseta stoa costae mozzetta pest aceta resat resit wrest besot least zesty deist doughiest lest beset vista geest chesty yeast
cues cause causey cuisse cuss cusso guess kues ecus cukes ukes