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.
dawn dan down dean tawny danio downy tawney dun don din tan den dino town dyne deny dene deni dine done tain dona dune deign diene donee donna donne tauon towny
awn fawn lawn mawn gnawn pawn sawn dawn shawn yawn an