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.
but butt bute bout buteo butty beaut butte beauty bought bet bud bit bot bat boat batt bota boot bedu beet bate baht beta beat baud bitt byte bite bott bait boite batty bawty buddy betta battu bitty booty biota bateau battue bawtie bootee bootie