pitched battle vs Battle of Bosworth Field

pitched battle and Battle of Bosworth Field both are nouns.

Word	Noun	Adjective	Verb	Adverb
pitched battle	Yes	No	No	No
Battle of Bosworth Field	Yes	No	No	No

pitched battle (noun)	Battle of Bosworth Field (noun)
a fierce battle fought in close combat between troops in predetermined positions at a chosen time and place	the battle that ended the Wars of the Roses (1485); Richard III was killed and Henry Tudor was crowned as Henry VII