Let me add my own take on this, so it's just my personal opinion:
Cinematographer, if there's such a term, is typically the director of photography who has shot a movie screened in the cinema. To me, that's the "real" cinematography. Such a person is typically a member of ASC or BSC, HKSC, etc. Of cos, we have some people trying to market themselves as cinematographers such as those doing wedding "cinema". I don't blame them. It's part of the marketing game.
Videographer comes about as a short form to address people who shoot mainly events and weddings.
Otherwise, in TV or corporate work, the one operating the camera is typically known just as the cameraman and if you are the really experienced guy who can do good lighting, lead a team of camera crew, operate very good camera work, I will call you a director of photography. Philip Bloom is one.
My 2 cts.