pitched battle vs Thermopylae

pitched battle and Thermopylae both are nouns.

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

pitched battle (noun)	Thermopylae (noun)
a fierce battle fought in close combat between troops in predetermined positions at a chosen time and place	a famous battle in 480 BC; a Greek army under Leonidas was annihilated by the Persians who were trying to conquer Greece