Kingdom of Spain vs Spain

Kingdom of Spain and Spain both are nouns.

Word	Noun	Adjective	Verb	Adverb
Kingdom of Spain	Yes	No	No	No
Spain	Yes	No	No	No

As nouns, Kingdom of Spain and Spain are synonyms defined as:

Kingdom of Spain and Spain: a parliamentary monarchy in southwestern Europe on the Iberian Peninsula; a former colonial power

Other synonyms of Kingdom of Spain include Espana.

Kingdom of Spain (noun)	Spain (noun)
a parliamentary monarchy in southwestern Europe on the Iberian Peninsula; a former colonial power	a parliamentary monarchy in southwestern Europe on the Iberian Peninsula; a former colonial power