Lombard Street vs Greater London

Lombard Street and Greater London both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lombard Street	Yes	No	No	No
Greater London	Yes	No	No	No

Lombard Street (noun)	Greater London (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