calm vs quiet

calm and quiet both are nouns.

Word	Noun	Adjective	Verb	Adverb
calm	Yes	Yes	Yes	No
quiet	Yes	Yes	Yes	Yes

As nouns, quiet is a hyponym of calm; that is, quiet is a word with a more specific, narrower meaning than calm:

As verbs, calm and quiet are synonyms defined as:

Other synonyms of calm include calm down, lull, quieten, still, tranquilize, tranquillise, tranquillize.

calm (noun)	quiet (noun)
steadiness of mind under stress	a disposition free from stress or emotion
wind moving at less than 1 knot; 0 on the Beaufort scale	the absence of sound
	a period of calm weather
	an untroubled state; free from disturbances

calm (adjective)	quiet (adjective)
(of weather) free from storm or wind	free of noise or uproar; or making little if any sound
not agitated; without losing self-possession	characterized by an absence or near absence of agitation or activity
	(of the sun) characterized by a low level of surface phenomena, such as sunspots
	(of a body of water) free from disturbance by heavy waves
	in a softened tone
	not showy or obtrusive

calm (verb)	quiet (verb)
cause to be calm or quiet as by administering a sedative to	make calm or still
make steady	become quiet or quieter
make calm or still
become quiet or calm, especially after a state of agitation

calm (adverb)	quiet (adverb)
	with little or no activity or no agitation (`quiet' is a nonstandard variant for `quietly')