sniper

noun8

1. •
   A person using long-range small arms for precise attacks from a concealed position.

   • The sniper shot him in the head.
2. •
   Any attacker using a non-contact weapon against a specific target from a concealed position.
3. •
   One who shoots from a concealed position.

   • The British, having cleared the open field, now faced the problem of advancing through the trees into the sniper fire of several hundred Virginia militia. — 1874
4. •
   (slang) A player who specializes in scoring goals.

   • Alexander Ovechkin is often regarded as the greatest sniper of his generation.
5. •
   A sniper rifle.
6. •
   A person or automated process set up by a person who or which attempts to win an online auction by placing a bid only seconds before the auction ends, leaving no time for other bidders to respond

   • The smart sniper slips in and places the final winning bid when it's too late for the other bidder to respond. — 2012
7. •
   One who criticizes; a person who frequently snipes at others.

   • They always sniped at each other in public. German snipers were a wishy-washy lot compared with Lester and his wife. — 1968
8. •
   A hunter of snipe (the bird).