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.
quokkas quags kakas quakes quicks quacks quaggas quickies keeks cocas cokes kooks gucks gowks cocks kecks kicks gooks kagus kakis cooks kikes cukes cocoas guacos kaiaks caiques cookeys cookies cuckoos guaiacs
quokkas okas hookahs hookas kakas okays sukkahs tikkas tokays chukkas kas