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.
warty wart ward wert wort wared whort wordy waired warred weirdy worrit wearied whereat whereto word
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
war wair ware wary waur wear weary aware sware