kingdom vs realm

kingdom and realm both are nouns.

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

As nouns, kingdom and realm are synonyms defined as:

As nouns, kingdom and realm are synonyms defined as:

Other synonyms of kingdom include land.

kingdom (noun)	realm (noun)
a basic group of natural objects	a knowledge domain that you are interested in or are communicating about
a monarchy with a king or queen as head of state	the domain ruled by a king or queen
the highest taxonomic group into which organisms are grouped; one of five biological categories: Monera or Protoctista or Plantae or Fungi or Animalia	a domain in which something is dominant
the domain ruled by a king or queen
a country with a king as head of state
a domain in which something is dominant