fisticuffs vs mouthpiece

fisticuffs and mouthpiece both are nouns.

Word	Noun	Adjective	Verb	Adverb
fisticuffs	Yes	No	No	No
mouthpiece	Yes	No	No	No

fisticuffs (noun)	mouthpiece (noun)
fighting with the fists	the aperture of a wind instrument into which the player blows directly
a fight with bare fists	the tube of a pipe or cigarette holder that a smoker holds in the mouth
	an acoustic device; the part of a telephone into which a person speaks
	(especially boxing) equipment that protects an athlete's mouth
	a part that goes over or into the mouth of a person
	a spokesperson (as a lawyer)