This is the 1218th most frequent Portuguese word.
livros
Books.
Here, 'livros' is used to denote the physical objects, referring to multiple books.
Eu comprei alguns livros novos ontem.
I bought some new books yesterday.
In this sentence, 'livros' refers generally to books in the context of one's appreciation for their characteristics.
Os livros antigos têm um charme especial.
Old books have a special charm.
The word 'livros' here is used to describe a collection of books that possess the quality of being informative.