turban vs headdress

turban and headdress both are nouns.

Word	Noun	Adjective	Verb	Adverb
turban	Yes	No	No	No
headdress	Yes	No	No	No

As nouns, headdress is a hypernym of turban; that is, headdress is a word with a broader meaning than turban:

turban: a traditional Muslim headdress consisting of a long scarf wrapped around the head
headdress: clothing for the head

Other hypernyms of turban include headgear.

turban (noun)	headdress (noun)
a traditional Muslim headdress consisting of a long scarf wrapped around the head	clothing for the head
a small round woman's hat