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.
hydrops hydropsy drops droops dropsy dorps drips drapes drupes tropes troops troupes towropes tarps traps trips turps trapes tripes tripos traipse
drops hydrops troops hydropsy ropes roups crops croups gropes groups hyperopes preops props pyropes dorps drips droops dropsy towropes tropes