input device vs peripheral

input device and peripheral both are nouns.

Word	Noun	Adjective	Verb	Adverb
input device	Yes	No	No	No
peripheral	Yes	Yes	No	No

As nouns, peripheral is a hypernym of input device; that is, peripheral is a word with a broader meaning than input device:

input device: a device that can be used to insert data into a computer or other computational device
peripheral: electronic equipment external to the circuit board that contains the CPU of a computer

Other hypernyms of input device include computer peripheral, peripheral device.

input device (noun)	peripheral (noun)
a device that can be used to insert data into a computer or other computational device	electronic equipment external to the circuit board that contains the CPU of a computer

input device (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