program library vs assemblage

program library and assemblage both are nouns.

Word	Noun	Adjective	Verb	Adverb
program library	Yes	No	No	No
assemblage	Yes	No	No	No

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

program library: (computing) a collection of standard programs and subroutines that are stored and available for immediate use
assemblage: several things grouped together or considered as a whole

Other hypernyms of program library include accumulation, aggregation, collection.

program library (noun)	assemblage (noun)
(computing) a collection of standard programs and subroutines that are stored and available for immediate use	the social act of assembling
	a system of components assembled together for a particular purpose
	a group of persons together in one place
	several things grouped together or considered as a whole