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.
tier tiro tire tear teary terai terra terry terrae try tar tor toro tori torr true dere tyre dire doughier tory tray trow trey tahr troy tora tour dear doer tree tare trio deer tore taro tyro deary tarre deray derry torah diary torii tarry dairy deair
bier vier gooier kier lier pier wrier zooier doughier tier shier er