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.
grot grout griot groat grotto grouty garote grotty grit grat garotte garrote greet grody grate great garrotte croute gritty garret carrot cowrote carroty grad kart curt crit grid cart quart kraut korat guard crate karat gored court caret carat carte gourd crowd gride credo cruet garda greed krait grade kurta curet quirt
rot carrot grot lirot parrot pierrot tarot torot trot