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.
depone deepen doupioni douppioni teopan tiepin
pone depone youpon yapon chopine upon spooney gipon supine spoon repine hypopnea lupine coupon capon jupon jeepney eupnea spine hyponea poon pony pion pine peon pane opine rapine apnea weapon shippon yaupon yupon