Alexander III of Russia vs Alexander III

Alexander III of Russia and Alexander III both are nouns.

Word	Noun	Adjective	Verb	Adverb
Alexander III of Russia	Yes	No	No	No
Alexander III	Yes	No	No	No

As nouns, Alexander III of Russia and Alexander III are synonyms defined as:

Alexander III of Russia and Alexander III: son of Alexander II who was czar of Russia (1845-1894)

Other synonyms of Alexander III of Russia include Czar Alexander III.

Alexander III of Russia (noun)	Alexander III (noun)
son of Alexander II who was czar of Russia (1845-1894)	son of Alexander II who was czar of Russia (1845-1894)