CPU vs processor

CPU and processor both are nouns.

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

As nouns, CPU and processor are synonyms defined as:

CPU and 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, central processor, mainframe.

CPU (noun)	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
	a business engaged in processing agricultural products and preparing them for market
	someone who processes things (foods or photographs or applicants etc.)