area vs kingdom

area and kingdom both are nouns.

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

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

area (noun)	kingdom (noun)
a part of a structure having some specific characteristic or function	a basic group of natural objects
the extent of a 2-dimensional surface enclosed within a boundary	a monarchy with a king or queen as head of state
a part of an animal that has a special function or is supplied by a given artery or nerve	the highest taxonomic group into which organisms are grouped; one of five biological categories: Monera or Protoctista or Plantae or Fungi or Animalia
a subject of study	the domain ruled by a king or queen
a particular geographical region of indefinite boundary (usually serving some special purpose or distinguished by its people or culture or geography)	a country with a king as head of state
a particular environment or walk of life	a domain in which something is dominant