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.
croaky croak creaky cracky crake crack crook creak crock corky carack craggy crikey carioca curacoa carrack crickey cark cork crag croc grok cargo creek crick cruck groggy quirky curacao karaoke
croaky corky dorky sarky porky narky larky croak creaky cracky freaky rocky forky euroky braky barky rooky darky troak