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.
hydro hydra hydrae hydria tyro duro hydriae dor dry dire tyre taro toro dree dure dour door dray dare trow drew trio dore dear durr draw tahr dere deer dorr doer dura tiro troy
hydro gyro pyro duro hydra tyro