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.
dirt dirty dart drat diorite derat dorty droit derate deaired hydrate deaerate tart tret tort trot tarot trait druid dread dreed dried droid dured dared tarty tired torot torta torte treat trite trout