striker

noun

1. a person who strikes; specif.,
   1. a worker who is on strike
   2. an assistant who wields the heavy sledgehammer for a blacksmith
2. a thing that strikes, as the clapper in a bell, the striking device in a clock, etc.
3. ☆
   1. U.S. Army an enlisted man doing extra-duty work for an officer for extra pay
   2. U.S. Navy an enlisted man who is working to qualify for a rating
4. Soccer the forward and main scorer of a soccer team