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.
possess posses poses poussies pisses pusses passes poises posies pussies poesies puses pases passus peises peases pauses psis pisos paces puces pesos psoas paisas paseos peaces pieces piceous
assess reassess possess pussies lassies gausses quasses gneisses josses lessees hussies jesses biasses mousses gessoes bossies busses bosses tusses tosses basses posses chesses reissues chasses wusses passes gussies poussies tassies esses cesses cusses sasses sissies dassies dosses sises losses missies pisses hisses musses lasses messes isseis wisses sisses loesses sassies disses susses tissues tasses masses hissies fusses chausses cissies guesses cuisses mosses pusses asses fesses gasses wrasses nesses wussies kisses issues misses fosses lassoes tussehs yesses
posse pose passe passee poise poussie