battleground vs battlefield

battleground and battlefield both are nouns.

Word	Noun	Adjective	Verb	Adverb
battleground	Yes	No	No	No
battlefield	Yes	No	No	No

As nouns, battleground and battlefield are synonyms defined as:

battleground and battlefield: a region where a battle is being (or has been) fought

Other synonyms of battleground include field, field of battle, field of honor.

battleground (noun)	battlefield (noun)
a region where a battle is being (or has been) fought	a region where a battle is being (or has been) fought