glimpse vs looking at

glimpse and looking at both are nouns.

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

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

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

Other hypernyms of glimpse include look, looking.

glimpse (noun)	looking at (noun)
a quick look	the act of directing the eyes toward something and perceiving it visually; look
a brief or incomplete view
a vague indication

glimpse (verb)	looking at (verb)
catch a glimpse of or see briefly