Amaterasu Omikami vs Amaterasu

Amaterasu Omikami and Amaterasu both are nouns.

Word	Noun	Adjective	Verb	Adverb
Amaterasu Omikami	Yes	No	No	No
Amaterasu	Yes	No	No	No

As nouns, Amaterasu Omikami and Amaterasu are synonyms defined as:

Amaterasu Omikami and Amaterasu: central deity of Shinto; goddess personifying the sun and ancestress of the rulers of Japan

Amaterasu Omikami (noun)	Amaterasu (noun)
central deity of Shinto; goddess personifying the sun and ancestress of the rulers of Japan	central deity of Shinto; goddess personifying the sun and ancestress of the rulers of Japan