program library vs aggregation

program library and aggregation both are nouns.

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

As nouns, aggregation is a hypernym of program library; that is, aggregation 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
aggregation: several things grouped together or considered as a whole

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

program library (noun)	aggregation (noun)
(computing) a collection of standard programs and subroutines that are stored and available for immediate use	the act of gathering something together
	several things grouped together or considered as a whole