How do you spell Piercer

Available Definitions:
1)  n. - One who, or that which, pierces or perforates
2)  n. - An instrument used in forming eyelets; a stiletto.
3)  n. - A piercel.
4)  n. - The ovipositor, or sting, of an insect.
5)  n. - An insect provided with an ovipositor.