Spain vs Kingdom of Spain

Spain and Kingdom of Spain both are nouns.

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

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

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

Other synonyms of Spain include Espana.

Spain (noun)	Kingdom of 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