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.
capered coappeared coopered coppered copyread kippered cooperate cuprite
capered peppered paupered tapered kippered zippered loppered coopered choppered lappered papered supered coppered diapered lippered chippered perdu preed speared spiered perdy coappeared spored reappeared lipread pried pared spared speered rapiered spired spread appeared vapored peered pored speired
caper capoeira capper coper gaper