Lombard Street vs British capital

Lombard Street and British capital both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lombard Street	Yes	No	No	No
British capital	Yes	No	No	No

Lombard Street (noun)	British capital (noun)
a street in central London containing many of the major London banks	the capital and largest city of England; located on the Thames in southeastern England; financial and industrial and cultural center