sight setting vs gun-sight

sight setting and gun-sight both are nouns.

Word	Noun	Adjective	Verb	Adverb
sight setting	Yes	No	No	No
gun-sight	Yes	No	No	No

As nouns, gun-sight is a hypernym of sight setting; that is, gun-sight is a word with a broader meaning than sight setting:

sight setting: the adjustment of a gunsight for elevation and windage on a particular range under favorable light conditions
gun-sight: a sight used for aiming a gun

Other hypernyms of sight setting include gunsight.

sight setting (noun)	gun-sight (noun)
the adjustment of a gunsight for elevation and windage on a particular range under favorable light conditions	a sight used for aiming a gun