Overland Campaign vs battle of Spotsylvania Courthouse

Overland Campaign and battle of Spotsylvania Courthouse both are nouns.

Word	Noun	Adjective	Verb	Adverb
Overland Campaign	Yes	No	No	No
battle of Spotsylvania Courthouse	Yes	No	No	No

Overland Campaign (noun)	battle of Spotsylvania Courthouse (noun)
American Civil War; a series of indecisive battles in Grant's campaign (1864) against Lee in which both armies suffered terrible losses	a battle between the armies of Grant and Lee during the Wilderness Campaign