library routine vs procedure

library routine and procedure both are nouns.

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

As nouns, procedure is a hypernym of library routine; that is, procedure is a word with a broader meaning than library routine:

Other hypernyms of library routine include function, routine, subprogram, subroutine.

library routine (noun)	procedure (noun)
a debugged routine that is maintained in a program library	a particular course of action intended to achieve a result
	a mode of conducting legal and parliamentary proceedings
	a process or series of acts especially of a practical or mechanical nature involved in a particular form of work
	a set sequence of steps, part of larger computer program