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.
repin repine rapine rapini reopen repugn rappini ripieni ripieno ripen rappen
repin tiepin pin chopin supine pina deepen spiny spin repine rapini piny rappini rapine pepino pein pian pine pippin lapin apian lipin lupin lupine kneepan opine papain pain cioppino pion spine chopine
rep reap repay repo repp rupiah arepa crepe crepey crepy prep prepay preppie preppy