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.
vapory vapoury vapor vapour viper foppery
vapory pry dupery spray spoor sopor sapor repour peppery napery kouprey coppery coopery japery vapoury vapour foppery vapor apery prey pray pour pore poor mopery papery popery ropery sapour spiry spore spry whipray