peripheral vs data processor

peripheral and data processor both are nouns.

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

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

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