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.
ruffe ruff raff riff rife revue raffia roofie ref rev rif roughhew rave reef reif rive roof rove
bouffe pouffe ruffe chuff cuff tuff coiffe duff gaffe huffy ruff puff buff quiff quaff guff pouffy coffee piaffe luffa puffy feoffee buffy buffo buffi luff muff pouff fife huff toffee waffie chuffy