quieten vs still

quieten is not a noun while still is a noun.

Word	Noun	Adjective	Verb	Adverb
quieten	No	No	Yes	No
still	Yes	Yes	Yes	Yes

As verbs, quieten and still are synonyms defined as:

Other synonyms of quieten include hush, hush up, shut up, silence.

As verbs, quieten and still are synonyms defined as:

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

quieten (noun)	still (noun)
	an apparatus used for the distillation of liquids; consists of a vessel in which a substance is vaporized by heat and a condenser where the vapor is condensed
	a static photograph (especially one taken from a movie and used for advertising purposes)
	a plant and works where alcoholic drinks are made by distillation
	(poetic) tranquil silence

quieten (adjective)	still (adjective)
	not sparkling
	used of pictures; of a single or static photograph not presented so as to create the illusion of motion; or representing objects not capable of motion
	(of a body of water) free from disturbance by heavy waves
	marked by absence of sound
	not in physical motion
	free from noticeable current

quieten (verb)	still (verb)
cause to be quiet or not talk	cause to be quiet or not talk
make calm or still	make motionless
become quiet or quieter	make calm or still
	lessen the intensity of or calm

quieten (adverb)	still (adverb)
	to a greater degree or extent; used with comparisons
	with reference to action or condition; without change, interruption, or cessation
	without moving or making a sound
	despite anything to the contrary (usually preceding a concession)