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.
drupes drapes troupes drips dorps drops droops tropes dropsy tripes trapes hydrops hydropsy towropes tarps traps trips turps troops tripos traipse trapeze trapezia trapezii trappose trappous
croupes troupes drupes grippes sirups ripes burps rupees roups ropes frappes tropes serapes groupies larrups hyperopes pyropes herpes trapes turps chirrups harpies rappees grapes gropes syrups croups rapes crapes crappies creepies preppies croppies urps gripes crepes drapes groups liriopes towropes tripes cripes sarapes sharpies
drupe dorp drape drapey drip drippy drop