If you can shoot snipe, than you a sniper!

The word "sniper" is derived from the verb "to snipe," which means to shoot at individuals from a concealed or distant position. The term "sniper" originally referred to a hunter or marksman who specialized in shooting game birds known as "snipe." 

The word "snipe" is a species of bird which is difficult to shoot because of its elusive nature and camouflage.Over the time this term being use to refer someone who shoot from distance with a rifle, specially trained for it.