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.
blowby blob bilby blabby blebby bellboy blab bleb blub bulb bullyboy bilbo balboa bilboa
blowby lobby looby lowboy colby globby plowboy slobby
blowy blow below blaw blew blooey blooie bolo bowl lowball