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.
dido did dado didy died ditto didie diode dit dad dud dot duit duad dita dead tidy dato dodo dote diet doty doat doit tide dite dada deed dude datto deity daddy teiid dotty duddy dowdy deedy doody teddy ditty toddy