hush

[1]	shush , silence , still , quiet
[2]	suppress , quieten , silence , mute , soften , still , shut up , soft-pedal , whisper , hush up
[3]	quieten , hush up , suppress , quiet , quiesce , repress , quash , quiet down , pipe down , cover up , hide , conceal , keep quiet , (Colloq) squelch
[4]	soothe , allay , calm , quiet , mollify , pacify , placate , tranquillize

[1]	stillness , still
[2]	silence , quiet , stillness , peace , tranquillity

interj.

[1]	Shush! , Quiet! , Be/Keep quiet/silent/still! , Hold your tongue! , Mum's the word! , (Slang) Shut up! , Clam up! , Shut your trap! , Button your lip! , Shut your gob! , (Brit) Belt up! , (US) Hush up! , Shut your face! , (US) Hush your mouth!