passport vs official document

passport and official document both are nouns.

Word	Noun	Adjective	Verb	Adverb
passport	Yes	No	No	No
official document	Yes	No	No	No

As nouns, official document is a hypernym of passport; that is, official document is a word with a broader meaning than passport:

passport: a document issued by a country to a citizen allowing that person to travel abroad and re-enter the home country
official document: (law) a document that states some contractual relationship or grants some right

Other hypernyms of passport include instrument, legal document, legal instrument.

passport (noun)	official document (noun)
any quality or characteristic that gains a person a favorable reception or acceptance or admission	(law) a document that states some contractual relationship or grants some right
a document issued by a country to a citizen allowing that person to travel abroad and re-enter the home country
any authorization to pass or go somewhere