jurisprudence vs legal duty

jurisprudence and legal duty both are nouns.

Word	Noun	Adjective	Verb	Adverb
jurisprudence	Yes	No	No	No
legal duty	Yes	No	No	No

jurisprudence (noun)	legal duty (noun)
the branch of philosophy concerned with the law and the principles that lead courts to make the decisions they do	acts which the law requires be done or forborne
the collection of rules imposed by authority