stacks vs library

stacks and library both are nouns.

Word	Noun	Adjective	Verb	Adverb
stacks	Yes	No	No	No
library	Yes	No	No	No

stacks (noun)	library (noun)
storage space in a library consisting of an extensive arrangement of bookshelves where most of the books are stored	a depository built to contain books and other materials for reading and study
a large number or amount	a room where books are kept
	a building that houses a collection of books and other materials
	a collection of literary documents or records kept for reference or borrowing
	(computing) a collection of standard programs and subroutines that are stored and available for immediate use