A writer, simply put is one who writes. Everyone who writes on a regular basis is considered a writer whether or not they have ever been published.
Writers can mean those who write for newspapers or those who write
fiction, those who write for medical journals, or those who write TV
sitcom scripts. They all write. They all get Writer's Block. What is a writer?
A writer is someone who writes, probably every day or nearly so. Usually
they feel compelled to write, as though they have no control over it.
It is as though they will die if they cannot write something down. Their
every fiber burns with the sensation, the uncontrollable passion, that
they must put words to paper in order to survive. They feel every
emotion their characters feel: the love, the pain, the horror, the fear,
the anxiety, and the lust for adventure. They not only feel their
characters, they become their characters. Everything in life sparks a
new story idea. They awake at night from their sleep to jot down in
notebooks. They are obsessed with the fever that is coming known as
writing. That is a writer.
An author however, is generally perceived as a writer who has been
published. For some writers, it is enough that they write, publishing
their work is not their goal. For most writers, however, the goal is to
become a published author. The trick is being published.