front line vs battlefront

front line and battlefront both are nouns.

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

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

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

Other synonyms of front line include front.

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