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.
pistou piste pesto pst piosity past pest post psst pseud paste pasty pesty pasta posit peised pissed poised posset postie pseudo peseta pastie passado paucity
pistou stoa stow bestow gusto missout pesto cestoi xystoi
pis paisa paise peise pias pies piso piss pois poise pips