safe-conduct vs passport

safe-conduct and passport both are nouns.

Word	Noun	Adjective	Verb	Adverb
safe-conduct	Yes	No	No	No
passport	Yes	No	No	No

As nouns, passport is a hypernym of safe-conduct; that is, passport is a word with a broader meaning than safe-conduct:

safe-conduct: a document or escort providing safe passage through a region especially in time of war
passport: any authorization to pass or go somewhere

Other hypernyms of safe-conduct include pass.

safe-conduct (noun)	passport (noun)
a document or escort providing safe passage through a region especially in time of war	any quality or characteristic that gains a person a favorable reception or acceptance or admission
	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