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.
trad trade triad tread tirade turd trod tried treat trait dread tared tyred tired torta trued treed tardo tardy trode torrid dorado toroid tarred teredo treaty triode tiered toured teared tarried tret trot tart drat tort tarot derat torte dreed torot dried dared droid tarty dured druid trite trout