Noun

• S: (n) mute, deaf-mute, deaf-and-dumb person (a deaf person who is unable to speak)
• direct hyponym / full hyponym
• direct hypernym / inherited hypernym / sister term
• derivationally related form
• S: (n) mute (a device used to soften the tone of a musical instrument)

Verb

• S: (v) muffle, mute, dull, damp, dampen, tone down (deaden (a sound or noise), especially by wrapping)

Adjective

• S: (adj) mute, tongueless, unspoken, wordless (expressed without speech) "a mute appeal"; "a silent curse"; "best grief is tongueless"- Emily Dickinson; "the words stopped at her lips unsounded"; "unspoken grief"; "choking exasperation and wordless shame"- Thomas Wolfe
• S: (adj) dumb, mute, silent (unable to speak because of hereditary deafness)