| verb | conceal or hide “smother a yawn” |
| verb | deaden (a sound or noise), especially by wrapping |
| adjective | being or made softer or less loud or clear “the dull boom of distant breaking waves” |
| adjective | wrapped up especially for protection or secrecy “children muffled almost to the eyebrows” |
| smotherer | noun | a person who stifles or smothers or suppresses |
| stifler | noun | a person who stifles or smothers or suppresses |
| stifling | noun | forceful prevention; putting down by power or authority |
| muffler | noun | a device that decreases the amplitude of electronic, mechanical, acoustical, or aerodynamic oscillations |
| mute | noun | a device used to soften the tone of a musical instrument |
| damper | noun | a device that decreases the amplitude of electronic, mechanical, acoustical, or aerodynamic oscillations |