passport vs legal document

passport and legal document both are nouns.

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

As nouns, legal document is a hypernym of passport; that is, legal 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
legal document: (law) a document that states some contractual relationship or grants some right

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

passport (noun)	legal 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