realm vs land

realm and land both are nouns.

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

As nouns, land is a hypernym of realm; that is, land is a word with a broader meaning than realm:

Other hypernyms of realm include demesne, domain.

As nouns, realm and land are synonyms defined as:

Other synonyms of realm include kingdom.

realm (noun)	land (noun)
a knowledge domain that you are interested in or are communicating about	agriculture considered as an occupation or way of life
the domain ruled by a king or queen	a politically organized body of people under a single government
a domain in which something is dominant	the people who live in a nation or country
	territory over which rule or control is exercised
	the territory occupied by a nation
	the solid part of the earth's surface
	material in the top layer of the surface of the earth in which plants can grow (especially with reference to its quality or use)
	extensive landed property (especially in the country) retained by the owner for his own use
	the land on which real estate is located
	a domain in which something is dominant

realm (verb)	land (verb)
	bring into a different state
	reach or come to rest
	cause to come to the ground
	arrive on shore
	bring ashore
	shoot at and force to come down
	deliver (a blow)