jurisprudence vs letters patent

jurisprudence and letters patent both are nouns.

Word	Noun	Adjective	Verb	Adverb
jurisprudence	Yes	No	No	No
letters patent	Yes	No	No	No

jurisprudence (noun)	letters patent (noun)
the branch of philosophy concerned with the law and the principles that lead courts to make the decisions they do	an official document granting a right or privilege
the collection of rules imposed by authority