jurisprudence vs letters testamentary

jurisprudence and letters testamentary both are nouns.

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

jurisprudence (noun)	letters testamentary (noun)
the branch of philosophy concerned with the law and the principles that lead courts to make the decisions they do	a legal document from a probate court or court officer informing you of your appointment as executor of a will and empowering you to discharge those responsibilities
the collection of rules imposed by authority