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.
booboo boob booby bob boobie boubou baboo bobby bib bub
booboo boo baboo boob hobo gobo kobo lobo oboe poboy taboo yobbo
boob boobie booboo booby boo bob bobby boubou looby doobie