pitched battle vs Somme River

pitched battle and Somme River both are nouns.

Word	Noun	Adjective	Verb	Adverb
pitched battle	Yes	No	No	No
Somme River	Yes	No	No	No

pitched battle (noun)	Somme River (noun)
a fierce battle fought in close combat between troops in predetermined positions at a chosen time and place	battle in World War I (1916)
	battle of World War II (1944)