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.
dowdy doody didy tody doty dodo daddy teddy toddy diode dotty toady duddy deedy doodoo dot dad did dud doughty doit tidy died duty doat dada dead dote dato deed dido dude dawt duad dado
howdy rowdy dowdy soddy shadowy noddy wady moody toddy meadowy toady doody goody gowd hoody boody body bawdy towy today tody woody shoddy
dowdy dow howdah howdie howdy gowd rowdy diode dodo doodoo doody