peek vs looking at

peek and looking at both are nouns.

Word	Noun	Adjective	Verb	Adverb
peek	Yes	No	Yes	No
looking at	Yes	No	No	No

As nouns, looking at is a hypernym of peek; that is, looking at is a word with a broader meaning than peek:

peek: a secret look
looking at: the act of directing the eyes toward something and perceiving it visually; look

Other hypernyms of peek include look, looking.

peek (noun)	looking at (noun)
a secret look	the act of directing the eyes toward something and perceiving it visually; look

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