boarding pass vs laissez passer

boarding pass and laissez passer both are nouns.

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

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

boarding pass: a pass that allows you to board a ship or plane
laissez passer: a document indicating permission to do something without restrictions

Other hypernyms of boarding pass include pass.

boarding pass (noun)	laissez passer (noun)
a pass that allows you to board a ship or plane	a document indicating permission to do something without restrictions