nybble vs computer memory unit

nybble and computer memory unit both are nouns.

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

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

nybble (noun)	computer memory unit (noun)
a small byte	a unit for measuring computer memory