gunsight vs sights

gunsight and sights both are nouns.

Word	Noun	Adjective	Verb	Adverb
gunsight	Yes	No	No	No
sights	Yes	No	No	No

As nouns, sights is a hypernym of gunsight; that is, sights is a word with a broader meaning than gunsight:

gunsight: a sight used for aiming a gun
sights: an optical instrument for aiding the eye in aiming, as on a firearm or surveying instrument

gunsight (noun)	sights (noun)
a sight used for aiming a gun	an optical instrument for aiding the eye in aiming, as on a firearm or surveying instrument