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.
quagga quaggy quag gaga quack quake quaky guaiac quacky quokka gag
dagga quagga aga ragg taiga saggy raga saiga saga reggae raggy quaggy naggy baggy gaga jaggy jagg giga faggy loggia shaggy
quagga quag quaggy qua quai quay aqua aquae quack quacky quake quaky squaw