central processing unit vs CPU

central processing unit and CPU both are nouns.

Word	Noun	Adjective	Verb	Adverb
central processing unit	Yes	No	No	No
CPU	Yes	No	No	No

As nouns, central processing unit and CPU are synonyms defined as:

central processing unit and CPU: (computer science) the part of a computer (a microprocessor chip) that does most of the data processing

Other synonyms of central processing unit include C.P.U., central processor, mainframe, processor.

central processing unit (noun)	CPU (noun)
(computer science) the part of a computer (a microprocessor chip) that does most of the data processing	(computer science) the part of a computer (a microprocessor chip) that does most of the data processing