military vs mess hall

military and mess hall both are nouns.

Word	Noun	Adjective	Verb	Adverb
military	Yes	Yes	No	No
mess hall	Yes	No	No	No

military (noun)	mess hall (noun)
the military forces of a nation	a (large) military dining room where service personnel eat or relax

military (adjective)	mess hall (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