1)An author is the creator or originator of any written work such as a book or play, and is also considered a writer or poet. More broadly defined, an author is “the person who originated or gave existence to anything” and whose authorship determines responsibility for what was created.
2) A writer is a person engaged in writing books, articles, stories, etc., especially as an occupation or profession
3) A creator is a person, who invents, produces, or makes things, this person often imagines possibilities no one else would have considered and follows through to develop concepts, designs, or content.