autocrat
NounWordNet 3.0
Webster's Dictionary (GCIDE)
Autocrat \Au"to*crat\, n. [Gr. ?; ? self + ? strength, ? strong: cf. F. autocrate. See Hard, a.]
1.An absolute sovereign; a monarch who holds and exercises the powers of government by claim of absolute right, not subject to restriction; as, Autocrat of all the Russias (a title of the Czar). [1913 Webster]
2.One who rules with undisputed sway in any company or relation; a despot. [1913 Webster]
The autocrat of the breakfast table. --Holmes. [1913 Webster] Autocratic