How to Say "book collection" in Spanish
The Spanish word for “book collection” is “biblioteca” — A1 level. This is a very common word in everyday Spanish.

Examples
Fui a la biblioteca municipal para estudiar en silencio.
I went to the municipal library to study in silence.
La biblioteca de mi abuelo tiene más de mil libros antiguos.
My grandfather's book collection (library) has more than a thousand old books.
Necesito sacar un carné de biblioteca para poder llevarme los libros a casa.
I need to get a library card to be able to take the books home.
Always Feminine
Remember that 'biblioteca' is always feminine, so you must use 'la' or 'una' before it: 'la biblioteca'.
Confusing 'Librería'
Mistake: “Using 'librería' when you mean a place to borrow books.”
Correction: A 'librería' is a bookstore (where you buy books). A 'biblioteca' is a library (where you borrow books).
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