library vs library routine

library and library routine both are nouns.

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

library (noun)	library routine (noun)
a depository built to contain books and other materials for reading and study	a debugged routine that is maintained in a program library
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