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.
freely ferly frilly fairly ferrel fierily virelay frailly furrily farl furl farle feral frail frill ferial ferula ferule verily ferlie ferrule ferulae virally virelai
freely reel sheerly direly relay rely barely ferly virelay creel cruelly greyly queerly merely purely rarely sorely surely cheerly yarely
free fare fere fire fore frae froe fever reefer reefier refer referee revere reverie revery