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.
buffo buff boffo buffi buffy bouffe baff biff boff baffy biffy beef
buffo huffy chuff duff ruff puff pouffe bouffe buff buffi buffy huff boffo guff cuff quaff quiff luff luffa muff pouff pouffy puffy ruffe tuff chuffy