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.
knucklier knuckler nuclear nigglier niggler
hacklier sicklier knucklier chuckler buckler fickler hackler heckler cackler likelier mickler scalier suckler tackler tickler weaklier knuckler shackler