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.
flicker flickery flackery flockier flaker flakier flukier folkier flaggier fulcra flagger flogger filigree valkyr velcro
flicker slicker licker clicker pluckier blacker flackery milker blockier clocker clacker flockier locker bilker blocker liker lacker colickier plucker slacker luckier flickery shlockier
flick flic flack fleck flecky flock flocky folic