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.
pistous pistes pestos posts pests pasts pussytoes piosities pseuds pastes pastas possets pesetas pseudos posties pasties passados passadoes poussettes pastis posits pesades posadas
pistous setous xystos cestus situs stoas stoss stows acetous bestows fastuous caestus custos gustoes maestoso missouts pestos cestos cistus xystus
pistou pesto piste episode pst