C.P.U. vs computer hardware

C.P.U. and computer hardware both are nouns.

Word	Noun	Adjective	Verb	Adverb
C.P.U.	Yes	No	No	No
computer hardware	Yes	No	No	No

As nouns, computer hardware is a hypernym of C.P.U.; that is, computer hardware is a word with a broader meaning than C.P.U.:

C.P.U.: (computer science) the part of a computer (a microprocessor chip) that does most of the data processing
computer hardware: (computer science) the mechanical, magnetic, electronic, and electrical components making up a computer system

Other hypernyms of C.P.U. include electronic equipment, hardware.

C.P.U. (noun)	computer hardware (noun)
(computer science) the part of a computer (a microprocessor chip) that does most of the data processing	(computer science) the mechanical, magnetic, electronic, and electrical components making up a computer system