jurisprudence vs blue ribbon jury

jurisprudence and blue ribbon jury both are nouns.

Word	Noun	Adjective	Verb	Adverb
jurisprudence	Yes	No	No	No
blue ribbon jury	Yes	No	No	No

jurisprudence (noun)	blue ribbon jury (noun)
the branch of philosophy concerned with the law and the principles that lead courts to make the decisions they do	a jury whose members are selected for special knowledge for a case involving complicated issues
the collection of rules imposed by authority