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.
frocks forks frogs fracas freaks forgoes foregoes frugs frigs frags farragoes fricassee phreaks viragos varicose verrucas viragoes
rocks trocks frocks crocks brocks torcs rocs drecks ricks pricks croaks cracks groks crooks durocs orcs tricksy crocs cricks racks brooks carracks rooks caracks rucks heroics derricks hayricks trucks tracks reracks hayracks drouks troaks tricks tarocs karaokes dorks bricks porks corks forks crucks recks taroks wrecks crocus ruckus cariocas irokos wracks borks barracks arracks wricks trokes works