war vs Vietnam War

war and Vietnam War both are nouns.

Word	Noun	Adjective	Verb	Adverb
war	Yes	No	Yes	No
Vietnam War	Yes	No	No	No

war (noun)	Vietnam War (noun)
the waging of armed conflict against an enemy	a prolonged war (1954-1975) between the communist armies of North Vietnam who were supported by the Chinese and the armies of South Vietnam who were supported by the United States
a concerted campaign to end something that is injurious
an active struggle between competing entities
a legal state created by a declaration of war and ended by official declaration during which the international rules of war apply

war (verb)	Vietnam War (verb)
make or wage war