der Buchautor
book author
A person who writes books professionally or as a hobby; an author of books.
Der bekannte Buchautor hält eine Lesung aus seinem neuesten Roman.
The well-known book author is giving a reading from his latest novel.

book author
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book author
A person who writes books professionally or as a hobby; an author of books.
Der bekannte Buchautor hält eine Lesung aus seinem neuesten Roman.
The well-known book author is giving a reading from his latest novel.

'Buchautor' (book author) is a compound noun made up of 'das Buch' (book) and 'der Autor' (author). So it literally refers to a person who writes books.
Er träumt davon, eines Tages ein erfolgreicher Buchautor zu sein.
He dreams of being a successful book author one day.
The component 'Buch-' (book) serves to specify the type of author. This pattern is very productive in German, as seen in words like 'Drehbuchautor' (screenwriter, for films) or 'Fachbuchautor' (specialist/nonfiction author).
Sie ist eine bekannte Kinderbuchautorin.
She is a well-known children's book author.
Certain activities are often associated with a 'Buchautor' (book author). Typical phrases are: 'eine Lesung halten' (to give a reading), 'sein neues Buch vorstellen' (to present one's new book), or 'ein Interview geben' (to give an interview).
Nächste Woche hält der Buchautor eine Lesung in der Stadtbibliothek.
Next week, the book author is giving a reading at the city library.
author
'der Autor' and 'der Buchautor' are very closely related, but they are not equally specific. 'Autor' is the general term for someone who writes and publishes texts, for example articles, books, or academic texts. 'Buchautor' says more precisely that someone writes books. The words can be confused because every 'Buchautor' is also an 'Autor'. But not every 'Autor' writes books. If you do not want to specify the type of text, 'Autor' is appropriate. If it is explicitly about books, 'Buchautor' sounds more precise.

Der Buchautor stellt am Montag seinen neuen Roman in der Bibliothek vor.
On Monday, the book author is presenting his new novel at the library.
Nach dem Vortrag spricht Herr Braun kurz mit dem Autor des Artikels.
After the talk, Mr. Braun briefly speaks with the author of the article.