virtual memory vs memory board

virtual memory and memory board both are nouns.

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

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

virtual memory: (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 memory include computer memory, computer storage, memory, storage, store.

virtual memory (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