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.
dad dead duad dada dado daddy tad dud did dido date didy dodo doat toad died dato daut deed data dawt dude dita today didie teddy dowdy datto doody deedy duddy toady diode toddy dautie dawtie doodoo duddie