battle sight vs gunsight

battle sight and gunsight both are nouns.

Word	Noun	Adjective	Verb	Adverb
battle sight	Yes	No	No	No
gunsight	Yes	No	No	No

As nouns, gunsight is a hypernym of battle sight; that is, gunsight 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
gunsight: a sight used for aiming a gun

Other hypernyms of battle sight include gun-sight.

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