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.
quaffer gaffer quaver gauffer quavery coffer goffer kaffir quiver quivery coiffeur caver gofer kafir cougher goofier
gaffer piaffer chaffer zaffer quaffer chafer differ deafer leafier zaffre reoffer iffier wafery kaffir goffer puffery gauffer coiffeur coffer duffer chaffier chauffer chuffer niffer huffier loafer puffier puffer safer deffer daffier zaffir suffer miffier feoffer buffier offer fifer doffer wafer whiffer zaffar buffer chaufer chauffeur chuffier fer