optic vs peeper

optic and peeper both are nouns.

Word	Noun	Adjective	Verb	Adverb
optic	Yes	Yes	No	No
peeper	Yes	No	No	No

As nouns, peeper is a hyponym of optic; that is, peeper is a word with a more specific, narrower meaning than optic:

Other hyponyms of optic include naked eye, oculus dexter, OD, oculus sinister, OS, ocellus, simple eye, stemma, compound eye.

optic (noun)	peeper (noun)
the organ of sight	an animal that makes short high-pitched sounds
	an informal term referring to the eye
	a viewer who enjoys seeing the sex acts or sex organs of others

optic (adjective)	peeper (adjective)
of or relating to or resembling the eye
relating to or using sight