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.
leprose leprosy leprous lepers leapers lopers lappers lippers loopers loppers
prose uprose leprose pros reprise prise leprous proas perse porose praos prase prese parse proso pross pyros apprise leprosy prosy operose prows repros purse uprise cuprous sparse uprouse