criminal law vs principal

criminal law and principal both are nouns.

Word	Noun	Adjective	Verb	Adverb
criminal law	Yes	No	No	No
principal	Yes	Yes	No	No

criminal law (noun)	principal (noun)
the body of law dealing with crimes and their punishment	the educator who has executive authority for a school
	an actor who plays a principal role
	the major party to a financial transaction at a stock exchange; buys and sells for his own account
	(criminal law) any person involved in a criminal offense, regardless of whether the person profits from such involvement
	the original amount of a debt on which interest is calculated
	capital as contrasted with the income derived from it

criminal law (adjective)	principal (adjective)
	most important element