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.
fawn fawny fan fain fane fano faun fauna fanny faena faunae van fon fen fin fun fine fino fohn foin vain vane feign fenny finny foehn funny
awn fawn lawn mawn gnawn pawn sawn dawn shawn yawn an