der Schriftsteller
writer
A person who writes literary texts such as novels, poems, or essays professionally; an author.
Der junge Schriftsteller arbeitet gerade an seinem zweiten Roman.
The young writer is currently working on his second novel.

writer
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writer
A person who writes literary texts such as novels, poems, or essays professionally; an author.
Der junge Schriftsteller arbeitet gerade an seinem zweiten Roman.
The young writer is currently working on his second novel.

The word is made up of 'Schrift' (writing/written text) and 'Steller' (someone who produces or creates something). A Schriftsteller is therefore literally a person who writes writings or texts.
Ein Schriftsteller ist jemand, der beruflich literarische Texte erstellt.
A writer is someone who creates literary texts professionally.
'Schriftsteller' (writer) belongs to the word family of 'schreiben' (to write) and 'die Schrift' (writing/script). All of these words have to do with the act of writing or with what is written.
Wer viel schreibt, ist nicht automatisch ein Schriftsteller.
Someone who writes a lot is not automatically a writer.
Common verbs used with 'Schriftsteller' (writer) describe the writer's work: 'einen Roman schreiben' (to write a novel), 'ein Buch veröffentlichen' (to publish a book), 'an einem Manuskript arbeiten' (to work on a manuscript), or 'einen Preis gewinnen' (to win a prize).
Der berühmte Schriftsteller hat für sein Buch einen wichtigen Preis gewonnen.
The famous writer won an important prize for his book.
author
'der Autor' and 'der Schriftsteller' are very close when it comes to literary texts. 'Autor' is broader and can also fit nonfiction books, articles, or academic texts. 'Schriftsteller' more often means a person who writes literary works, for example novels, poems, or essays, often as a profession. The words can be confused because a writer is always also the author of his or her texts. In practice: with a book, you can often say 'Autor'. If you want to emphasize the literary activity or the profession, 'Schriftsteller' sounds more natural.

Der Schriftsteller arbeitet seit zwei Jahren an einem Roman über seine Familie.
The writer has been working on a novel about his family for two years.
Auf dem Buchcover steht der Name des Autors ganz oben.
The author's name is at the very top of the book cover.