battlefront vs front line

battlefront and front line both are nouns.

Word	Noun	Adjective	Verb	Adverb
battlefront	Yes	No	No	No
front line	Yes	No	No	No

As nouns, battlefront and front line are synonyms defined as:

battlefront and front line: the line along which opposing armies face each other

Other synonyms of battlefront include front.

battlefront (noun)	front line (noun)
the line along which opposing armies face each other	the line along which opposing armies face each other