look vs peek

look and peek both are nouns.

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

As nouns, peek is a hyponym of look; that is, peek is a word with a more specific, narrower meaning than look:

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

As verbs, peek is a hyponym of look; that is, peek is a word with a more specific, narrower meaning than look:

look (noun)	peek (noun)
the act of directing the eyes toward something and perceiving it visually; look	a secret look
physical appearance
the feelings expressed on a person's face
the general atmosphere of a place or situation and the effect that it has on people

look (verb)	peek (verb)
to physically appear a certain way to another individual or group	throw a glance at; take a brief look at
look forward to the probable occurrence of
have faith or confidence in
convey by one's expression
perceive with attention; direct one's gaze towards; look
give a certain impression of being something or having a certain aspect
search or seek
take charge of or deal with
be oriented in a certain direction, often with respect to another reference point; be opposite to
accord in appearance with