headman vs tribal chief

headman and tribal chief both are nouns.

Word	Noun	Adjective	Verb	Adverb
headman	Yes	No	No	No
tribal chief	Yes	No	No	No

As nouns, headman and tribal chief are synonyms defined as:

Other synonyms of headman include chief, chieftain.

headman (noun)	tribal chief (noun)
the head of a tribe or clan	the head of a tribe or clan
an executioner who beheads the condemned person