deaf-mute vs dummy

deaf-mute and dummy both are nouns.

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

As nouns, dummy is a hyponym of deaf-mute; that is, dummy is a word with a more specific, narrower meaning than deaf-mute:

Other hyponyms of deaf-mute include silent person.

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

deaf-mute (adjective)	dummy (adjective)
lacking the sense of hearing and the ability to speak	having the appearance of being real but lacking capacity to function

deaf-mute (verb)	dummy (verb)
	make a dummy of