Second Battle of the Marne vs Battle of the Marne

Second Battle of the Marne and Battle of the Marne both are nouns.

Word	Noun	Adjective	Verb	Adverb
Second Battle of the Marne	Yes	No	No	No
Battle of the Marne	Yes	No	No	No

As nouns, Second Battle of the Marne and Battle of the Marne are synonyms defined as:

Second Battle of the Marne and Battle of the Marne: a World War I battle in northwestern France where the Allies defeated the Germans in 1918

Other synonyms of Second Battle of the Marne include Belleau Wood, Chateau-Thierry, Marne River.

Second Battle of the Marne (noun)	Battle of the Marne (noun)
a World War I battle in northwestern France where the Allies defeated the Germans in 1918	a World War I battle in northwestern France where the Allies defeated the Germans in 1918