hush vs quiet

hush and quiet both are nouns.

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

As nouns, quiet is a hypernym of hush; that is, quiet is a word with a broader meaning than hush:

Other hypernyms of hush include silence.

As verbs, hush and quiet are synonyms defined as:

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

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

hush (adjective)	quiet (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

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

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