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.
draped dripped drooped dropped trapped torpedo tripped trooped trouped dript dropt trapt dropout trippet
raped reaped craped draped drooped trouped parapet torpedo burped larruped roped repped rapped groped chirruped warped rapid crapped riped propped cirriped siruped ripped rouped griped tripped carped syruped urped rewrapped trapped creeped wrapped dripped creped cropped prepped trooped chirped dropped cirripede gripped bewrapped myriapod harped grouped frapped sharped
drape drapey dorp drip drippy drop drupe trap