Sir Robert Walpole vs national leader

Sir Robert Walpole and national leader both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sir Robert Walpole	Yes	No	No	No
national leader	Yes	No	No	No

Sir Robert Walpole (noun)	national leader (noun)
Englishman and Whig statesman who (under George I) was effectively the first British prime minister (1676-1745)	a person who is a respected leader in national or international affairs