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.
prawn pyran purana parian pirana pirn porn paranoea paranoia porno prone porny prion prune purin preen pereon pernio perron purine pyrene pyrone hyperon pereion perinea
prawn brawn drawn ran murrain crown pyran marrano brown guarani serrano grana grain brawny drain furane furan frown buran drown terrain train crane rani grown bran roan purana parian brain pirana loran gran saran rain reran curran guarana saurian sierran groan borane durian terrane shoran
para parae prao prau pray proa prow spray