peep vs peeper

peep and peeper both are nouns.

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

peep (noun)	peeper (noun)
a secret look	an animal that makes short high-pitched sounds
the short weak cry of a young bird	an informal term referring to the eye
	a viewer who enjoys seeing the sex acts or sex organs of others

peep (verb)	peeper (verb)
appear as though from hiding
make high-pitched sounds
speak in a hesitant and high-pitched tone of voice
look furtively
cause to come into view