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.
posit post piosity pst posset postie pest past psst pasta pasty piste posed pesty paste poussette pastie peseta poised posada paucity hypoacid
posit sit hessite hoist host hosta jesuit joist visit joust coset coast lost moist ghosty resit roast roset zoisite dost tost costa site moste most boost boast suit casita coesite cost foist lawsuit missuit oast piosity ghost oust post resite roost roust doest toast wost
psi poesy pois poise poos pose posse posy poussie pows apos epos pops popsie popsy