Synonyms for Hush (same or very similar meaning)
WordNet sense 1 ((poetic) tranquil silence):
still, stillnessWordNet sense 2 (become quiet or quieter):
quiet, quiesce, quieten, pipe down, quiet downWordNet sense 3 (cause to be quiet or not talk):
silence, shut up, hush upFrom the ODE community, based on WordNetadd/edit