GiB vs computer memory unit

GiB and computer memory unit both are nouns.

Word	Noun	Adjective	Verb	Adverb
GiB	Yes	No	No	No
computer memory unit	Yes	No	No	No

As nouns, computer memory unit is a hypernym of GiB; that is, computer memory unit is a word with a broader meaning than GiB:

GiB: a unit of information equal to 1024 mebibytes or 2^30 (1,073,741,824) bytes
computer memory unit: a unit for measuring computer memory

GiB (noun)	computer memory unit (noun)
a unit of information equal to 1024 mebibytes or 2^30 (1,073,741,824) bytes	a unit for measuring computer memory