Tb vs computer memory unit

Tb and computer memory unit both are nouns.

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

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

Tb: a unit of information equal to 1000 gigabits or 10^12 (1,000,000,000,000) bits
computer memory unit: a unit for measuring computer memory

Tb (noun)	computer memory unit (noun)
a unit of information equal to 1000 gigabits or 10^12 (1,000,000,000,000) bits	a unit for measuring computer memory
a metallic element of the rare earth group; used in lasers; occurs in apatite and monazite and xenotime and ytterbite