data processor vs peripheral

data processor and peripheral both are nouns.

Word	Noun	Adjective	Verb	Adverb
data processor	Yes	No	No	No
peripheral	Yes	Yes	No	No

data processor (noun)	peripheral (noun)
a machine for performing calculations automatically	electronic equipment external to the circuit board that contains the CPU of a computer

data processor (adjective)	peripheral (adjective)
	on or near an edge or constituting an outer boundary; the outer area
	related to the key issue but not of central importance