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.
garret garred garrote greet caret great garrotte garote carrot garotte carried carroty cart grot grit grat kart quarried carat guard grade garda carte cared cruet groat gored griot grout quart gride grate greed curet karat gardai quarte karate grotto gritty greedy caried create grotty grouty carate gourde curred quarto cardiae corrade corrode curette curried
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
gar carr carry gaur guar gurry karroo agar