boxing vs mouthpiece

boxing and mouthpiece both are nouns.

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

boxing (noun)	mouthpiece (noun)
fighting with the fists	the aperture of a wind instrument into which the player blows directly
the enclosure of something in a package or box	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)