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.
decays decoys decks decos degas dickeys degauss dexy docs daks dags dykes ducks dicks dawks docks dagos deoxy dukes dikes teaks dekes daggas dagoes dekkos teguas tokays dickies doggies duckies dex dioicous
cays decays showcase tokays cacaos case caws coys gays kays quays casa pacas cacas cocoas macaws micas ocas okays picas socas cocas cycas decoys chicas yucas