dummy vs mute

dummy and mute both are nouns.

Word	Noun	Adjective	Verb	Adverb
dummy	Yes	Yes	Yes	No
mute	Yes	Yes	Yes	No

As nouns, mute is a hypernym of dummy; that is, mute is a word with a broader meaning than dummy:

Other hypernyms of dummy include deaf-and-dumb person, deaf-mute.

dummy (noun)	mute (noun)
a figure representing the human form	a device used to soften the tone of a musical instrument
a cartridge containing an explosive charge but no bullet	a deaf person who is unable to speak
an ignorant or foolish person
a person who does not talk

dummy (adjective)	mute (adjective)
having the appearance of being real but lacking capacity to function	expressed without speech
	unable to speak because of hereditary deafness

dummy (verb)	mute (verb)
make a dummy of	deaden (a sound or noise), especially by wrapping