hall pass vs laissez passer

hall pass and laissez passer both are nouns.

Word	Noun	Adjective	Verb	Adverb
hall pass	Yes	No	No	No
laissez passer	Yes	No	No	No

As nouns, laissez passer is a hypernym of hall pass; that is, laissez passer is a word with a broader meaning than hall pass:

hall pass: written permission from a teacher for a student to be out the classroom and in the halls of the school
laissez passer: a document indicating permission to do something without restrictions

Other hypernyms of hall pass include pass.

hall pass (noun)	laissez passer (noun)
written permission from a teacher for a student to be out the classroom and in the halls of the school	a document indicating permission to do something without restrictions