Aleksandr Pavlovich vs Alexander I of Russia

Aleksandr Pavlovich and Alexander I of Russia both are nouns.

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

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

Aleksandr Pavlovich and Alexander I of Russia: 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 Aleksandr Pavlovich include Alexander I, Czar Alexander I.

Aleksandr Pavlovich (noun)	Alexander I of Russia (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)