Cosimo the Elder vs national leader

Cosimo the Elder and national leader both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cosimo the Elder	Yes	No	No	No
national leader	Yes	No	No	No

Cosimo the Elder (noun)	national leader (noun)
Italian financier and statesman and friend of the papal court (1389-1464)	a person who is a respected leader in national or international affairs