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.
bulbul bulbel bulbil bailable bilabial billable blowball blueball bluebell bluebill boilable
bulbul lobule bulbel bulbil globule
bulb balboa bilbo bilboa bilby blab blabby bleb blebby blob blub bullyboy