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.
duty duit duet doty daut doughty dotty tutty duddy ditty deity dautie dought dot dit dud tut dita tout deet tidy taut dote doat dite doit data dude dato dawt date tutu tody duad diet didy titty today tatty tutee teddy doody datto toady toddy ditto daddy tutti dowdy deedy