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.
heritor heartier herder harder hurter hardier hoarder
heritor rotor traitor hydrator writer barrator barretor aerator gyrator corridor cowriter curator narrator orator pretor rewriter sartor deaerator territory triter
heart hearty hereto heriot herried