battle line vs military

battle line and military both are nouns.

Word	Noun	Adjective	Verb	Adverb
battle line	Yes	No	No	No
military	Yes	Yes	No	No

battle line (noun)	military (noun)
the line along which warring troops meet	the military forces of a nation

battle line (adjective)	military (adjective)
	associated with or performed by members of the armed services as contrasted with civilians
	characteristic of or associated with soldiers or the military
	of or relating to the study of the principles of warfare