Ashur vs Asur

Ashur and Asur both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ashur	Yes	No	No	No
Asur	Yes	No	No	No

As nouns, Ashur and Asur are synonyms defined as:

Ashur and Asur: an ancient Assyrian city on the Tigris and traditional capital of Assyria; just to the south of the modern city of Mosul in Iraq

Other synonyms of Ashur include Assur.

Ashur (noun)	Asur (noun)
an ancient Assyrian city on the Tigris and traditional capital of Assyria; just to the south of the modern city of Mosul in Iraq	an ancient Assyrian city on the Tigris and traditional capital of Assyria; just to the south of the modern city of Mosul in Iraq
chief god of the Assyrians; god of military prowess and empire; identified with Babylonian Anshar