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.
crake creak croak crack carack croaky cracky crikey creaky crag crickey karaoke carrack cork cark corky creek crick crock crook cruck craggy carioca curacao curacoa croc grok kirk
rake berake brake drake crake raki rakee rack broke freak wrack hayrack track birkie raku wreak croak traik troak turkey peruke karaoke darkey carrack rerack barrack darkie phreak braky arrack arak carack ryke creak break crack burke trike troke shrike
craw cakier racker raker chakra