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.
terret turret terete territ tret treat treaty teared teredo tarred tiered tarried trot tart tort treed trout tired tarty torot tread derat trait tared tarot torta tyred deride torrid toured trouty deaired
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
terra terrae terry derry tarre tarry tear teary terai tier torr stere stereo tetra tetri uteri