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.
tiro tier taro tire tyro toro trow trio troy tor try tar tray tore true tear tour dire tyre tora tori trey tare duro torr tory tree tahr dairy torii torah tarry hydro diary terry deair terra tarre terai teary