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.
slicker slacker slaker sulker silkier sleeker sulkier slaggier sleekier slogger slugger
flicker slicker licker clicker pluckier blacker flackery milker blockier clocker clacker flockier locker bilker blocker liker lacker colickier plucker slacker luckier flickery shlockier