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.
paste pastie past piste pasta pasty pst paused postie passed post psst pest passade posit paced posed pesto pesty pseud poussette peaced pissed poised posset pesade peised pseudo pistou passado paucity piosity
baste chaste taste waste haste caste paste ghast wast past ceased pasty listee sayst costae sate east misate caseate maist cast roast roseate hessite beastie nauseate yeast geste testee teased rased resite eased toasty lased beast fast feased biased fissate testae hast chased bast coast cased phased saute mustee stey mayst hasty mast moste coesite pastie zoisite leased site vestee piste oast postie boast based vast mestee lysate fossate last least nasty vasty feast pasta toast waist tasty gast stew yeasty
pas paws spas paps pias pease peas pays pause paisa passee passe pass paseo pase paise upas