plea-bargain vs plea bargaining

plea-bargain is not a noun while plea bargaining is a noun.

Word	Noun	Adjective	Verb	Adverb
plea-bargain	No	No	Yes	No
plea bargaining	Yes	No	No	No

plea-bargain (noun)	plea bargaining (noun)
	(criminal law) a negotiation in which the defendant agrees to enter a plea of guilty to a lesser charge and the prosecutor agrees to drop a more serious charge

plea-bargain (verb)	plea bargaining (verb)
agree to plead guilty in return for a lesser charge