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.
fraps frappes forepaws
raps traps wraps fraps rewraps bewraps craps warps reaps grapes serapes larrups rips corpus turps drapes crapes preps reps crops harps props rapes drops sharps syrups chirrups gorps sirups urps burps perps carpus dorps corps hydrops trips drips chirps carps corpse grips tarps herpes sarapes trapes priapus sherpas