dummy vs deaf-mute

dummy and deaf-mute both are nouns.

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

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

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

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

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

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