peeper vs looker

peeper and looker both are nouns.

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

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

peeper: a viewer who enjoys seeing the sex acts or sex organs of others
looker: a close observer; someone who looks at something (such as an exhibition of some kind)

Other hypernyms of peeper include spectator, viewer, watcher, witness.

peeper (noun)	looker (noun)
an animal that makes short high-pitched sounds	a very attractive or seductive looking woman
an informal term referring to the eye	a close observer; someone who looks at something (such as an exhibition of some kind)
a viewer who enjoys seeing the sex acts or sex organs of others