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.
tomb tom tomboy toom tome tommy tam dom time doom doum tame dumb teem dome team doomy douma dumbo duomi duomo tammy tummy