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.
poussette posset psst post piste paste posit posed postie passed poised pissed paused peseta passade piosity pst past pest pasta pasty pesty pseud
fossette cassette poussette settee bassett casette musette noisette rosette sett
posse poussie spouse pose puss