nominee vs political leader

nominee and political leader both are nouns.

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

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

Other hypernyms of nominee include pol, politician, politico.

nominee (noun)	political leader (noun)
a politician who is running for public office	a person active in party politics