coup d'oeil vs looking

coup d'oeil and looking both are nouns.

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

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

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

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

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

coup d'oeil (adjective)	looking (adjective)
	appearing to be as specified; usually used as combining forms