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.
fen fenny faena foehn feign fan fun fin fon fino fohn fain fane foin fine fawn fano vein vena faun veena venae veiny fawny funny finny fauna fanny venue faunae hyphen