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.
pierce piers perse peres price pricey peruse piracy peeress prese prise pairs pricy peris prees peers pears pries prize hypers paries praise purees parries peeries perries prossie
fierce terce coerce pierce tierce peres haeres terse brace farce mercy seres perse force quaeres cerci truce trace terrace feres grace farcie meres price ceres source rice verse heres orrice race trice wheres
pier per spirea spiraea piper opera apery aper perry peri perea pereia pere peery peerie peer pear pair spier spire spiry