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