sphere vs kingdom

sphere and kingdom both are nouns.

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

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

sphere (noun)	kingdom (noun)
any spherically shaped artifact	a basic group of natural objects
a particular aspect of life or activity	a monarchy with a king or queen as head of state
the geographical area in which one nation is very influential	the highest taxonomic group into which organisms are grouped; one of five biological categories: Monera or Protoctista or Plantae or Fungi or Animalia
the apparent surface of the imaginary sphere on which celestial bodies appear to be projected	the domain ruled by a king or queen
a solid figure bounded by a spherical surface (including the space it encloses)	a country with a king as head of state
a three-dimensional closed surface such that every point on the surface is equidistant from the center	a domain in which something is dominant
a particular environment or walk of life