jurisprudence vs action at law

jurisprudence and action at law both are nouns.

Word	Noun	Adjective	Verb	Adverb
jurisprudence	Yes	No	No	No
action at law	Yes	No	No	No

jurisprudence (noun)	action at law (noun)
the branch of philosophy concerned with the law and the principles that lead courts to make the decisions they do	a judicial proceeding brought by one party against another; one party prosecutes another for a wrong done or for protection of a right or for prevention of a wrong
the collection of rules imposed by authority