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.
viol viola vill vail vole vial veil vile villa voile villi voila volley villae fil fowl foul fail fila file foil vela fool foal vale filo fill veal folio vealy fille value ghoul foley phial filly folly fillo folia