program library vs accumulation

program library and accumulation both are nouns.

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

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

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

program library (noun)	accumulation (noun)
(computing) a collection of standard programs and subroutines that are stored and available for immediate use	the act of accumulating
	several things grouped together or considered as a whole
	(finance) profits that are not paid out as dividends but are added to the capital base of the corporation
	an increase by natural growth or addition