How do you spell Nipper

Available Definitions:
1)  n. - One who, or that which, nips.
2)  n. - A fore tooth of a horse. The nippers are four in number.
3)  n. - A satirist.
4)  n. - A pickpocket; a young or petty thief.
5)  n. - The cunner.
6)  n. - A European crab (Polybius Henslowii).