blue law vs jurisprudence

blue law and jurisprudence both are nouns.

Word	Noun	Adjective	Verb	Adverb
blue law	Yes	No	No	No
jurisprudence	Yes	No	No	No

blue law (noun)	jurisprudence (noun)
a statute regulating work on Sundays	the branch of philosophy concerned with the law and the principles that lead courts to make the decisions they do
	the collection of rules imposed by authority