politician vs political leader

politician and political leader both are nouns.

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

As nouns, politician and political leader are synonyms defined as:

Other synonyms of politician include pol, politico.

politician (noun)	political leader (noun)
a person active in party politics	a person active in party politics
a leader engaged in civil administration
a schemer who tries to gain advantage in an organization in sly or underhanded ways