Vietnam vs Vietnamese

Vietnam and Vietnamese both are nouns.

Word	Noun	Adjective	Verb	Adverb
Vietnam	Yes	No	No	No
Vietnamese	Yes	Yes	No	No

Vietnam (noun)	Vietnamese (noun)
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	the Mon-Khmer language spoken in Vietnam
a communist state in Indochina on the South China Sea; achieved independence from France in 1945	a native or inhabitant of Vietnam

Vietnam (adjective)	Vietnamese (adjective)
	of or relating to or characteristic of Vietnam or its people or its language