coup d'oeil vs looking at

coup d'oeil and looking at both are nouns.

Word	Noun	Adjective	Verb	Adverb
coup d'oeil	Yes	No	No	No
looking at	Yes	No	No	No

As nouns, looking at is a hypernym of coup d'oeil; that is, looking at is a word with a broader meaning than coup d'oeil:

coup d'oeil: a quick look
looking at: the act of directing the eyes toward something and perceiving it visually; look

Other hypernyms of coup d'oeil include look, looking.

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