Chalons vs Chalons-sur-Marne

Chalons and Chalons-sur-Marne both are nouns.

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

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

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

Other synonyms of Chalons include Battle of the Catalaunian Plains.

Chalons (noun)	Chalons-sur-Marne (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