peek vs looking

peek and looking both are nouns.

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

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

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

Other hypernyms of peek include look, looking at.

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

peek (adjective)	looking (adjective)
	appearing to be as specified; usually used as combining forms

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