underage vs jurisprudence

underage is not a noun while jurisprudence is a noun.

Word	Noun	Adjective	Verb	Adverb
underage	No	Yes	No	No
jurisprudence	Yes	No	No	No

underage (noun)	jurisprudence (noun)
	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

underage (adjective)	jurisprudence (adjective)
not of legal age
dependent by virtue of youth