From what I understand, the title of your book can be a copyrighted word. But, it can't be titled using something that is trademarked. So, if I wanted to, I could (legally) get away with making my book's title "Wuthering Heights". But, if the title of my fictional novel was "The Microsoft Corporation" I'd get in trouble... Is my understanding correct? Is there any kind of database out there with all trademarked words?