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.
head heady had hied heed hued heat hade hoed haed heydey heyday hid het hod hat hate haut hide hood haet haute hoody howdy
bead head lead mead knead read dead ad ed