American Civil War vs Battle of Hampton Roads

American Civil War and Battle of Hampton Roads both are nouns.

Word	Noun	Adjective	Verb	Adverb
American Civil War	Yes	No	No	No
Battle of Hampton Roads	Yes	No	No	No

American Civil War (noun)	Battle of Hampton Roads (noun)
civil war in the United States between the North and the South; 1861-1865	a naval battle of the American Civil War (1862); the indecisive battle between the Monitor and the Merrimac