How do you spell Chaser

Available Definitions:
1)  n. - One who or that which chases; a pursuer; a driver; a hunter.
2)  n. - Same as Chase gun, esp. in terms bow chaser and stern chaser. See under Bow, Stern.
3)  n. - One who chases or engraves. See 5th Chase, and Enchase.
4)  n. - A tool with several points, used for cutting or finishing screw threads, either external or internal, on work revolving in a lathe.