Czar Alexander I vs Aleksandr Pavlovich

Czar Alexander I and Aleksandr Pavlovich both are nouns.

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

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

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

Czar 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)