jack
noun
1.
a small worthless amount
2.
someone who works with their hands; someone engaged in manual labor
3.
4.
a small ball at which players aim in lawn bowling
5.
an electrical device consisting of a connector socket designed for the insertion of a plug
6.
game equipment consisting of one of several small six-pointed metal pieces that are picked up while bouncing a ball in the game of jacks
7.
small flag indicating a ship's nationality
8.
one of four face cards in a deck bearing a picture of a young prince
9.
10.
any of several fast-swimming predacious fishes of tropical to warm temperate seas