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.
dart dirt tart drat deaerate tarot derat dirty tarty droit dared dorty derate hydrate deaired diorite trot tort tret dured tared trite treat dread droid druid tardo trait dreed tardy dried torot torta torte trout
art boart fart hart heart cart kart quart mart part peart dart tart wart chart