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.
turret terret tret treat treaty toured territ terete tarred tarried tart turd trot tort tread trade tired trued trout tarty trode tared torot torta dured treed tried trite tarot trait torte tyred teared teredo tiered tirade torrid triode trouty
ferret barret garret terret turret ret burred gnarred tret terete surety pierrot parred buret treat birred warred cruet barred caret hereto fret territ furred greet arete shirred knarred carrot beret tarred worrit garred hereat curred great marred jarred rete whereto parrot chirred purred curet ferrety erred forrit whereat whirred charred churred yirred
durr durra durrie tarre tarry terra terrae terry torr tour