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.
huffy huff howff haaf hoof howf
huffy buffy chuffy pouffy puffy buffi chuff tuff luffa taffy baffy muff buffo ruff luff biffy puff miffy bouffe pouffe chaffy duff guff quaff quiff buff iffy ruffe pouff cuff huff toffy jiffy daffy