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.
paranoia paranoea purana pirana parian pyran prawn porno pernio porn pirn purin porny preen prune prone prion pereon perron purine pyrene pyrone
paranoia crania paranoea urania