CPU vs central processor

CPU and central processor both are nouns.

Word	Noun	Adjective	Verb	Adverb
CPU	Yes	No	No	No
central processor	Yes	No	No	No

As nouns, CPU and central processor are synonyms defined as:

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

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

CPU (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