sachem vs political leader

sachem and political leader both are nouns.

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

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

Other hypernyms of sachem include pol, politician, politico.

sachem (noun)	political leader (noun)
a chief of a North American tribe or confederation (especially an Algonquian chief)	a person active in party politics
a political leader (especially of Tammany Hall)