Elam vs Susiana

Elam and Susiana both are nouns.

Word	Noun	Adjective	Verb	Adverb
Elam	Yes	No	No	No
Susiana	Yes	No	No	No

As nouns, Elam and Susiana are synonyms defined as:

Elam and Susiana: an ancient country in southwestern Asia to the east of the Tigris River (in what is modern Iran); was known for its warlike people

Other synonyms of Elam include Biblical Elam.

Elam (noun)	Susiana (noun)
an ancient country in southwestern Asia to the east of the Tigris River (in what is modern Iran); was known for its warlike people	an ancient country in southwestern Asia to the east of the Tigris River (in what is modern Iran); was known for its warlike people