battle vs Battle of Britain

battle and Battle of Britain both are nouns.

Word	Noun	Adjective	Verb	Adverb
battle	Yes	No	Yes	No
Battle of Britain	Yes	No	No	No

battle (noun)	Battle of Britain (noun)
a hostile meeting of opposing military forces in the course of a war	the prolonged bombardment of British cities by the German Luftwaffe during World War II and the aerial combat that accompanied it
an energetic attempt to achieve something
an open clash between two opposing groups (or individuals)

battle (verb)	Battle of Britain (verb)
battle or contend against in or as if in a battle