party boss vs politico

party boss and politico both are nouns.

Word	Noun	Adjective	Verb	Adverb
party boss	Yes	No	No	No
politico	Yes	No	No	No

As nouns, politico is a hypernym of party boss; that is, politico is a word with a broader meaning than party boss:

party boss: a leader in a political party who controls votes and dictates appointments
politico: a person active in party politics

Other hypernyms of party boss include pol, political leader, politician.

party boss (noun)	politico (noun)
a leader in a political party who controls votes and dictates appointments	a person active in party politics