Juan Carlos vs Juan Carlos I of Spain

Juan Carlos and Juan Carlos I of Spain both are nouns.

Word	Noun	Adjective	Verb	Adverb
Juan Carlos	Yes	No	No	No
Juan Carlos I of Spain	Yes	No	No	No

As nouns, Juan Carlos and Juan Carlos I of Spain are synonyms defined as:

Juan Carlos and Juan Carlos I of Spain: king of Spain since 1975 (born in 1938)

Other synonyms of Juan Carlos include Juan Carlos Victor Maria de Borbon y Borbon.

Juan Carlos (noun)	Juan Carlos I of Spain (noun)
king of Spain since 1975 (born in 1938)	king of Spain since 1975 (born in 1938)