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.
narco narc naric nark narky
arco narco arc turaco tarok barca baric cargo curacao curacoa largo marc pargo sargo daric taroc narc touraco naric turacou
gnar gnarr knar knarry naira nairu narrow nary near snare unary