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.
psoas pesos pisos paisas psis poaceous puses pases poses pisses pusses poises pauses peases posies pizzas posses passus peises paseos passes piazzas poesies possess pussies poussies
psoas sos saws mesas lyssas lassoes cussos gessoes kussos missays seas sass sous sows pesos paisas soys zoeas resays seesaws says visas misos pisos nauseas fossas massas lassos quassias cassias assais koussos essays gneissose bioassays bassos assays paseos naysays resaws resows tussahs