tankage vs storage

tankage and storage both are nouns.

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

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

tankage (noun)	storage (noun)
the act of storing in tanks	the commercial enterprise of storing goods and materials
the charge for storing something in tanks	the act of storing something
the quantity contained in (or the capacity of) a tank or tanks	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