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.
feign fen fin fain vein fino foin faena fenny foehn veiny finny fon fan fun fane fano faun fawn fine fohn vain vena vina vino viny
reign feign deign vein veiny coign meiny pein rein seine sign zein