demesne vs kingdom

demesne and kingdom both are nouns.

Word	Noun	Adjective	Verb	Adverb
demesne	Yes	No	No	No
kingdom	Yes	No	No	No

As nouns, kingdom is a hyponym of demesne; that is, kingdom is a word with a more specific, narrower meaning than demesne:

demesne (noun)	kingdom (noun)
territory over which rule or control is exercised	a basic group of natural objects
extensive landed property (especially in the country) retained by the owner for his own use	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
	the domain ruled by a king or queen
	a country with a king as head of state
	a domain in which something is dominant