Shakespearean vs Shakespearian

Shakespearean and Shakespearian both are nouns.

Word	Noun	Adjective	Verb	Adverb
Shakespearean	Yes	Yes	No	No
Shakespearian	Yes	Yes	No	No

As adjectives, Shakespearean and Shakespearian are synonyms defined as:

Shakespearean and Shakespearian: of or relating to William Shakespeare or his works

As nouns, Shakespearean and Shakespearian are synonyms defined as:

Shakespearean (noun)	Shakespearian (noun)
a Shakespearean scholar	a Shakespearean scholar

Shakespearean (adjective)	Shakespearian (adjective)
of or relating to William Shakespeare or his works	of or relating to William Shakespeare or his works