kingdom vs king

kingdom and king both are nouns.

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

kingdom (noun)	king (noun)
a basic group of natural objects	(chess) the weakest but the most important piece
a monarchy with a king or queen as head of state	one of the four playing cards in a deck bearing the picture of a king
the highest taxonomic group into which organisms are grouped; one of five biological categories: Monera or Protoctista or Plantae or Fungi or Animalia	a checker that has been moved to the opponent's first row where it is promoted to a piece that is free to move either forward or backward
the domain ruled by a king or queen	a male sovereign; ruler of a kingdom
a country with a king as head of state	a very wealthy or powerful businessman
a domain in which something is dominant	a male competitor who holds a preeminent position
	the husband or widower of a queen
	preeminence in a particular category or group or field