pitched battle vs Lexington and Concord

pitched battle and Lexington and Concord both are nouns.

Word	Noun	Adjective	Verb	Adverb
pitched battle	Yes	No	No	No
Lexington and Concord	Yes	No	No	No

pitched battle (noun)	Lexington and Concord (noun)
a fierce battle fought in close combat between troops in predetermined positions at a chosen time and place	the first battle of the American Revolution (April 19, 1775)