glance vs looking at

glance and looking at both are nouns.

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

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

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

Other hypernyms of glance include look, looking.

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

glance (verb)	looking at (verb)
hit at an angle
throw a glance at; take a brief look at