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.
did dido didy died diode didie dud dad dit dado dead dita dada duit dodo tidy dude tide doit dite diet duad deed deity teiid ditty ditto doody duddy dowdy daddy teddy deedy toddy dautie dawtie doodoo duddie