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.
riviere riviera river reiver revere riever reifier rover rifer raver revery reaver reefier referee refer reefer roofer reoffer reverie rougher
riviere vier vireo bouvier heavier jivier caviare leavier levier livier revere riviera savvier severe wavier
rive reive review drive trivia