printer vs peripheral device

printer and peripheral device both are nouns.

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

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

printer: (computer science) an output device that prints the results of data processing
peripheral device: electronic equipment external to the circuit board that contains the CPU of a computer

Other hypernyms of printer include computer peripheral, peripheral, printer, printing machine.

printer (noun)	peripheral device (noun)
a machine that prints	electronic equipment external to the circuit board that contains the CPU of a computer
(computer science) an output device that prints the results of data processing
someone whose occupation is printing