Mexican-American War vs war

Mexican-American War and war both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mexican-American War	Yes	No	No	No
war	Yes	No	Yes	No

Mexican-American War (noun)	war (noun)
after disputes over Texas lands that were settled by Mexicans the United States declared war on Mexico in 1846 and by treaty in 1848 took Texas and California and Arizona and New Mexico and Nevada and Utah and part of Colorado and paid Mexico $15,000,000	the waging of armed conflict against an enemy
	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

Mexican-American War (verb)	war (verb)
	make or wage war