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.
rapini rappini rapine ripieni repin rappen repine ripieno ripen reopen repugn
rappini rapini pin chopin pepino douppioni papain supine rapine spine lupine cioppino lupin repine lipin apian opine pain pein piny pine pina pian lapin pion pippin repin ripieni spin spiny doupioni tiepin chopine
rap crap drapey grapy grappa grapey grape crappy crappie crape frappe rape frap wrap rupiah reap rappee drape trap