Gun-sight and Sights

Gun-sight noun - A sight used for aiming a gun.

Sights and gun-sight are semantically related. In some cases you can use "Sights" instead a noun phrase "Gun-sight".

Sights noun - An optical instrument for aiding the eye in aiming, as on a firearm or surveying instrument.

Gun-sight and sights are semantically related. Sometimes you can replace phrase "Gun-sight" with "Sights", this terms are similar.