Chalons vs Battle of the Catalaunian Plains

Chalons and Battle of the Catalaunian Plains both are nouns.

Word	Noun	Adjective	Verb	Adverb
Chalons	Yes	No	No	No
Battle of the Catalaunian Plains	Yes	No	No	No

As nouns, Chalons and Battle of the Catalaunian Plains are synonyms defined as:

Chalons and Battle of the Catalaunian Plains: the battle in which Attila the Hun was defeated by the Romans and Visigoths in 451

Other synonyms of Chalons include Chalons-sur-Marne.

Chalons (noun)	Battle of the Catalaunian Plains (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