What is "nightmute"

Population (2000): 208
Housing Units (2000): 54
Land area (2000): 96.974056 sq. miles (251.161641 sq. km)
Water area (2000): 4.565912 sq. miles (11.825658 sq. km)
Total area (2000): 101.539968 sq. miles (262.987299 sq. km)
FIPS code: 53930
Located within: Alaska (AK), FIPS 02
Location: 60.527618 N, 164.819764 W
ZIP Codes (1990):
Note: some ZIP codes may be omitted esp. for suburbs.
Headwords: