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.
tret treat treaty turret terete terret tart tort trot tired trout tarot trait torte trued trade treed tared tarty trite torot tyred tried tread trode torta tarred tirade toured teredo territ trouty triode tiered teared tarried trad trod turd dried dured tardo tardy triad dared dread dreed
ret barret beret buret ferret fret caret curet garret terret tret turret