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.
tarty tart tardy tarot trouty treaty dart tort tret trot trout treat dorty trite dirty tardo tared trait torte torot terret territ tarred teared terete turret tarried dirt trad trod turd
arty warty party tarty hearty art cart quart hart quarto heart mart caret part treaty karat charity parroty peart purty surety dirty tardy tart ferrety chart shirty dorty cherty ferity carroty tarot verity wart bratty borty boart airt ratty kart parity forty carat carte pardy fart purity rarity dart hardy quarte lardy shorty
tar star tuatara tattooer tattier tatter tater tatar starry stare teary tahr tear tarry tarre taro tare tauter tuatera