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.
donor downer downier dinar denar diner tenor toner denier tonier denary tenour dinner denari dunner tonner deanery denarii
donor honor nor tenour goner senor noir nori boner honer honour junior snore canoer loner mooner pawnor senior senora sonar zoner manor sooner tenor minor toner
don dino dona done donee donna donne donnee down downy udon