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.
trapped tripped draped dripped dropped torpedo trippet trooped trouped trapt torpid trepid tripod drooped tripody
rapped bewrapped wrapped crapped rewrapped frapped trapped raped warped gripped propped harped dripped ripped draped craped cropped reaped carped dropped prepped tripped repped sharped