This is the 1062nd most frequent Spanish word.
libros
Books.
The word 'libros' is used here as a subject noun, referring to physical objects that contain written or printed material.
Los libros en la biblioteca son muy interesantes.
The books in the library are very interesting.
Here, 'libros' is used as a direct object, indicating the items being referred to in the context of purchase.
Necesito comprar algunos libros para la clase de literatura.
I need to buy some books for the literature class.
In this sentence, 'libros' is the object of the action 'reading', used to describe the activity involving the items referred to.