Chalons-sur-Marne vs Chalons

Chalons-sur-Marne and Chalons both are nouns.

Word	Noun	Adjective	Verb	Adverb
Chalons-sur-Marne	Yes	No	No	No
Chalons	Yes	No	No	No

As nouns, Chalons-sur-Marne and Chalons are synonyms defined as:

Chalons-sur-Marne and Chalons: the battle in which Attila the Hun was defeated by the Romans and Visigoths in 451

Other synonyms of Chalons-sur-Marne include Battle of the Catalaunian Plains.

Chalons-sur-Marne (noun)	Chalons (noun)
the battle in which Attila the Hun was defeated by the Romans and Visigoths in 451	the battle in which Attila the Hun was defeated by the Romans and Visigoths in 451