kingdom

a domain in which something is dominant; "the untroubled kingdom of reason"; "a land of make-believe"; "the rise of the realm of cotton in the south"

a country with a king as head of state

the domain ruled by a king or queen

a monarchy with a king or queen as head of state

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

a basic group of natural objects