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.
boon bony bone boney bonny bonne bonnie ben bun bin ban bani bunn bane buna bean been bene bine beano benne benni benny bunny
boon coon goon loon moon noon poon soon zoon toon shoon on
boo boob boobie booboo booby bo