stockpiling vs storage

stockpiling and storage both are nouns.

Word	Noun	Adjective	Verb	Adverb
stockpiling	Yes	No	No	No
storage	Yes	No	No	No

As nouns, storage is a hypernym of stockpiling; that is, storage is a word with a broader meaning than stockpiling:

Other hypernyms of stockpiling include repositing, reposition, warehousing.

stockpiling (noun)	storage (noun)
accumulating and storing a reserve supply	the commercial enterprise of storing goods and materials
	the act of storing something
	depositing in a warehouse
	a depository for goods
	an electronic memory device
	(computer science) the process of storing information in a computer memory or on a magnetic tape or disk