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.
modern moderne matron madrona madrone madrono midiron
modern darn sterna sauterne cedarn pterin durn tern terne adorn bittern eterne veteran hadron gittern cateran ladron moderne outearn pattern readorn cittern stern deuteron