Mexican War vs Battle of Buena Vista

Mexican War and Battle of Buena Vista both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mexican War	Yes	No	No	No
Battle of Buena Vista	Yes	No	No	No

Mexican War (noun)	Battle of Buena Vista (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	a pitched battle in the Mexican War in 1847; United States forces under Zachary Taylor defeated the Mexican forces under Santa Anna at a locality in northern Mexico