quiet vs hush

quiet and hush both are nouns.

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

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

Other hyponyms of quiet include still, stillness, speechlessness, quietness, soundlessness.

As verbs, quiet and hush are synonyms defined as:

Other synonyms of quiet include pipe down, quiesce, quiet down, quieten.

quiet (noun)	hush (noun)
a disposition free from stress or emotion	(poetic) tranquil silence
the absence of sound
a period of calm weather
an untroubled state; free from disturbances

quiet (adjective)	hush (adjective)
free of noise or uproar; or making little if any sound
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

quiet (verb)	hush (verb)
make calm or still	become quiet or still; fall silent
become quiet or quieter	cause to be quiet or not talk
	run water over the ground to erode (soil), revealing the underlying strata and valuable minerals
	wash by removing particles
	become quiet or quieter

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