Alexander I vs Aleksandr Pavlovich

Alexander I and Aleksandr Pavlovich both are nouns.

Word	Noun	Adjective	Verb	Adverb
Alexander I	Yes	No	No	No
Aleksandr Pavlovich	Yes	No	No	No

As nouns, Alexander I and Aleksandr Pavlovich are synonyms defined as:

Alexander I and Aleksandr Pavlovich: the czar of Russia whose plans to liberalize the government of Russia were unrealized because of the wars with Napoleon (1777-1825)

Other synonyms of Alexander I include Alexander I of Russia, Czar Alexander I.

Alexander I (noun)	Aleksandr Pavlovich (noun)
the czar of Russia whose plans to liberalize the government of Russia were unrealized because of the wars with Napoleon (1777-1825)	the czar of Russia whose plans to liberalize the government of Russia were unrealized because of the wars with Napoleon (1777-1825)