Harmonious, mild and serene are some other words for "calm".
Eased, placid, soothing, serene, tranquil and hushed are some more words.
peaceful, placid, or serene
serene(ness)
quiets
The word calm is an abstract noun; another is calmness. The word calm is also a verb and an adjective.
calm down
calm, lull, peaceful
Tranquil, serene.
Calm, serenity, tranquility.
tranquil, tranquility
Serene. Unruffled. Peaceful.
relax sleep calm down Repose.
Chilled, cool, calm. xanax
peacefulness solitude
Placid can mean calm, tranquil, quiet, or peaceful.
Chill out Relax Chillax Calm down