military vs leatherneck

military and leatherneck both are nouns.

Word	Noun	Adjective	Verb	Adverb
military	Yes	Yes	No	No
leatherneck	Yes	No	No	No

military (noun)	leatherneck (noun)
the military forces of a nation	a member of the United States Marine Corps

military (adjective)	leatherneck (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