peeper vs eye

peeper and eye both are nouns.

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

As nouns, eye is a hypernym of peeper; that is, eye is a word with a broader meaning than peeper:

Other hypernyms of peeper include oculus, optic.

peeper (noun)	eye (noun)
an animal that makes short high-pitched sounds	a small hole or loop (as in a needle)
an informal term referring to the eye	the organ of sight
a viewer who enjoys seeing the sex acts or sex organs of others	good discernment (either visually or as if visually)
	attention to what is seen
	an area that is approximately central within some larger region

peeper (verb)	eye (verb)
	look at