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.
panama paynim penname hyponym hyponymy
panama nam name nema noma anima bename byname enema kinema minima penname rename cinema dunam dynamo
pan paean pain pane panne pawn pawnee pean pian piano pina puna papain span