Poitiers vs pitched battle

Poitiers and pitched battle both are nouns.

Word	Noun	Adjective	Verb	Adverb
Poitiers	Yes	No	No	No
pitched battle	Yes	No	No	No

Poitiers (noun)	pitched battle (noun)
the battle in 1356 in which the English under the Black Prince defeated the French	a fierce battle fought in close combat between troops in predetermined positions at a chosen time and place