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.
okas okays oaks ocas okes okehs oquassa
kas hookas kakas quokkas okas pikas sikas skas takas tikkas wekas chukkas