central processing unit vs central processor

central processing unit and central processor both are nouns.

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

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

central processing unit and central processor: (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., CPU, mainframe, processor.

central processing unit (noun)	central processor (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