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.
befoul befool befall befell beflea beefalo beefily boffola bevel biofuel buffalo
afoul befoul foul joyful woeful boffola tufoli biofuel seafowl befool refuel awful lawful full ghoul fuel fowl fool foil foal peafowl rueful defuel waeful woful