(1):

(n.) A blackmailer in politics; also, one whose political influence can be bought.

(2):

(n.) A workman who is on a strike.

(3):

(n.) A wencher; a lewd man.

(4):

(n.) A harpoon; also, a harpooner.

(5):

(n.) One who, or that which, strikes; specifically, a blacksmith's helper who wields the sledge.