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.
rifler riffler riflery raffler reviler ruffler rufflier raveler reveler rivalry raveller revealer reveller revelry
baffler riffler rifler waffler shuffler muffler raffler whiffler ruffler shoveller wifelier beveler fleer caviler veiler filer feller volery awfuller beveller fueler wofuller lovelier wafflier biofouler raveller reveler reviler eviller caviller fouler siffleur woefuller chevalier flier leveller vealer cavalier feeler joyfuller defiler foolery viler fullery fuller fueller fowler befouler vealier filler valuer leveler lavalier livelier eviler faller flir revealer cavalero rufflier reveller raveler riflery shoveler
rifle reflew reflow refly rifely riffle trifle