battle sight vs gun-sight

battle sight and gun-sight both are nouns.

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

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

battle sight: an arrangement of sights that makes possible the rapid aiming of a firearm at short ranges
gun-sight: a sight used for aiming a gun

Other hypernyms of battle sight include gunsight.

battle sight (noun)	gun-sight (noun)
an arrangement of sights that makes possible the rapid aiming of a firearm at short ranges	a sight used for aiming a gun