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.
goofier gofer goffer coffer gaffer gopher gauffer coiffeur cover kafir kefir kaffir quiver cougher quaffer quivery
goofier fiery chaffier doffer defier roofer reifier puffier miffier leafier goffer gofer coffer iffier huffier hoofer fiver fifer feoffer buffier beefier loafer offer reefier reoffer daffier deifier woofer chuffier fer fir