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.
crook crock croak croaky cark grok cork croc crake corky crack creak cargo crick creek cruck crikey cracky creaky carack curacoa karaoke carioca curacao crickey carrack crag grog kirk
rook brook crook croak trock iroko tarok drouk grok crock euroky frock burgoo broke brock rooky rock troak troke
cooer crow cooker cookery rookery rookier