kingdom

(noun) a domain in which something is dominant. Synonyms: land, realm. Examples: "The untroubled kingdom of reason." "A land of make-believe." "The rise of the realm of cotton in the south."

(noun) a country with a king as head of state.

(noun) the domain ruled by a king or queen. Synonyms: realm.

(noun) a monarchy with a king or queen as head of state.

(noun) the highest taxonomic group into which organisms are grouped; one of five biological categories: Monera or Protoctista or Plantae or Fungi or Animalia.

(noun) a basic group of natural objects.