peripheral vs computer

peripheral and computer both are nouns.

Word	Noun	Adjective	Verb	Adverb
peripheral	Yes	Yes	No	No
computer	Yes	No	No	No

peripheral (noun)	computer (noun)
electronic equipment external to the circuit board that contains the CPU of a computer	a machine for performing calculations automatically
	an expert at calculation (or at operating calculating machines)

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