peek vs peep

peek and peep both are nouns.

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

As nouns, peek and peep are synonyms defined as:

peek (noun)	peep (noun)
a secret look	a secret look
	the short weak cry of a young bird

peek (verb)	peep (verb)
throw a glance at; take a brief look at	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