Similar word to silence:

blackout, calm, censorship, dead air, death, dumbness, hush, hush-hush, inarticulateness, iron curtain, laconism, lull, muteness, noiselessness, peace, quiescence, quiet, quietness, quietude, quietus, reserve, reticence, saturninity, secrecy, sleep, speechlessness, still, stillness, sulk, sullenness, taciturnity, uncommunicativeness