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.
creakier croakier corkier cracker croaker craggier corker crooker crockery crookery quirkier caracara greegree groggier grigri
brakier freakier croakier creakier barracker tracker darker prickier brickier perkier murkier forkier sharker phreaker rookier larker cracker barker jerkier marker breaker corkier parker trickier dorkier sarkier croaker porkier wreaker raker racker mirkier reekier larkier rockier quirkier barkier shriekier
creak creaky crack cracky crake creek croak croaky screak screaky