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.
woeful woful woefully waeful wofully waffly weevil wifely weevily weevilly
rueful woeful waeful foul woful fuel full afoul awful befoul joyful lawful liefly refel refly refuel defuel biofuel chiefly