Mbit vs computer memory unit

Mbit and computer memory unit both are nouns.

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

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

Mbit (noun)	computer memory unit (noun)
a unit of information equal to 1000 kilobits or 10^6 (1,000,000) bits	a unit for measuring computer memory