computer vs peripheral

computer and peripheral both are nouns.

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

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

computer (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