memory board vs hardware

memory board and hardware both are nouns.

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

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

memory board: an electronic memory device
hardware: (computer science) the mechanical, magnetic, electronic, and electrical components making up a computer system

Other hypernyms of memory board include computer hardware, memory device, storage device.

memory board (noun)	hardware (noun)
an electronic memory device	(computer science) the mechanical, magnetic, electronic, and electrical components making up a computer system
	major items of military weaponry (as tanks or missile)
	instrumentalities (tools or implements) made of metal