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.
psis posies pussies poesies pisos puses pesos psoas poussies pases poses passes pusses pisses paseos pauses paisas poises peases peises passus posses possess paces puces
sis miosis whosis tussis diesis psis oasis noesis gnosis missis meiosis basis lysis lassis cassis physis phasis whoosis chassis