relation back vs jurisprudence

relation back and jurisprudence both are nouns.

Word	Noun	Adjective	Verb	Adverb
relation back	Yes	No	No	No
jurisprudence	Yes	No	No	No

relation back (noun)	jurisprudence (noun)
(law) the principle that an act done at a later time is deemed by law to have occurred at an earlier time	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