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.
didy did tidy died dido didie diode dowdy doody duddy daddy toddy teddy deedy deity ditty dad dit dud dude dita dodo dead dite duad dada deed duty tide diet doit doty duit dado tody ditto dotty teiid titty toady today