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.
quaggas quags quacks quakes quokkas guaiacs gags kakas kagus gogos cacas gawks cacaos guacos kaiaks quicks caiques gawkies
daggas quaggas agas bagass haggis gigas jaggs loggias ragas raggs reggaes sagas saigas taigas gas ags