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.
grad grade grid grat grody greed gourd groat gored garda grate great gride guard gourde greedy garred gardai corrade crud curd grot cord card cred grit crude kraut greet korat crowd crate curdy cured griot cried carat cored creed credo cared grout caird karat krait kurta