silence

[1]	quiet , mute , hush , still , shush , calm , tranquillize , soothe , (Mainly Brit) quieten
[2]	mitigate , temper , mollify , take the sting out of , propitiate , pacify , blunt , suppress , repress , restrain , subdue , draw the fangs/teeth of , inhibit , put down , damp , mute , squelch , quash , emasculate , muzzle , muffle , shut off , gag , stifle , smother , deaden (the effect of)
[3]	hush , quieten , still , shut up , hush up

[1]	quiet , quietness , stillness , soundlessness , noiselessness , calm , calmness , hush , quietude , tranquillity , peace , peacefulness , serenity
[2]	speechlessness , quiet , muteness , dumbness , reticence , taciturnity , uncommunicativeness
[3]	muteness
[4]	secrecy , secretiveness