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.
shirker chirker sharker shrieker shriekier
mirker shirker chirker forker corker darker jerker barker forkier broker burker barkier jerkier murker parker raker quirkier larker porker lurker marker mirkier murkier perkier porkier sarkier dorkier worker corkier tricker sharker larkier pricker shrieker