library vs stacks

library and stacks both are nouns.

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

library (noun)	stacks (noun)
a depository built to contain books and other materials for reading and study	storage space in a library consisting of an extensive arrangement of bookshelves where most of the books are stored
a room where books are kept	a large number or amount
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