This is the 8255th most frequent Portuguese word.
terror
Extreme fear or intense dread.
In this context, the word 'terror' refers to the genre of the book, specifically horror.
O livro de terror que você me emprestou foi muito assustador.
The horror book you lent me was very scary.
Here, 'terror' describes a strong feeling of fear experienced by the subject of the sentence.
Ele sentiu um profundo terror ao estar sozinho no escuro.
He felt a profound terror when being alone in the dark.
In this usage, 'terror' refers to the state of intense fear caused by threats or violent actions.