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.
quackish cockish gawkish cockshy kickshaw
buckish hickish sickish peckish quackish cockish puckish rakish hawkish rikisha ricksha cockshy peakish mawkish gawkish bookish cuish weakish
quack quacky quake quaky quick quickie