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.
sagum scam scum scummy squama squamae skim
sagum gum gaum agma begum jugum guaiacum legume magma oakum degum
sag saga saggy sago saiga segue