virtual storage vs memory board

virtual storage and memory board both are nouns.

Word	Noun	Adjective	Verb	Adverb
virtual storage	Yes	No	No	No
memory board	Yes	No	No	No

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

virtual storage: (computer science) memory created by using the hard disk to simulate additional random-access memory; the addressable storage space available to the user of a computer system in which virtual addresses are mapped into real addresses
memory board: an electronic memory device

Other hypernyms of virtual storage include computer memory, computer storage, memory, storage, store.

virtual storage (noun)	memory board (noun)
(computer science) memory created by using the hard disk to simulate additional random-access memory; the addressable storage space available to the user of a computer system in which virtual addresses are mapped into real addresses	an electronic memory device