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.
sharker shirker shrieker shriekier chirker
barker marker sharker parker darker larker murkier jerker jerkier corkier breaker racker croakier broker mirker forker burker porker sarkier dorkier worker murker phreaker chirker barracker creakier lurker wreaker raker corker cracker croaker freakier quirkier porkier brakier larkier forkier perkier mirkier tracker barkier shirker
shark chark charka shirk shrike