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.
dropsy drops hydropsy droops hydrops dorps drips drupes tropes drapes troops troupes towropes traps trips tarps turps trapes tripes tripos traipse trappose trappous
dropsy hydropsy troops hyperopes crops croups gorps gropes roups groups corps props ropes pyropes dorps droops drops hydrops preops liriopes towropes tropes
drop dorp drape drapey drip drippy droop droopy drupe trop trope