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.
whack whacko whacky wack wacke wacko wacky wick wauk weak wake wag wok week weka whig woke
hack whack shack wacky heck haku hawk chock check whacko tacky wacke wacko sack rack knack wack shake shaky shuck back hock haik whacky shako jack wrack hake huck chuck chick shacko hick shock pack tack mack lack quacky quack jacky yack