storage vs holding

storage and holding both are nouns.

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

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

Other hypernyms of storage include keeping, retention.

storage (noun)	holding (noun)
the commercial enterprise of storing goods and materials	the act of retaining something
the act of storing something	something owned; any tangible or intangible possession that is owned by someone
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