politician vs leader

politician and leader both are nouns.

Word	Noun	Adjective	Verb	Adverb
politician	Yes	No	No	No
leader	Yes	No	No	No

As nouns, leader is a hypernym of politician; that is, leader is a word with a broader meaning than politician:

As nouns, leader is a hypernym of politician; that is, leader is a word with a broader meaning than politician:

politician (noun)	leader (noun)
a person active in party politics	a featured article of merchandise sold at a loss in order to draw customers
a leader engaged in civil administration	a person who rules or guides or inspires others
a schemer who tries to gain advantage in an organization in sly or underhanded ways