quieten vs suppress

quieten and suppress both are verbs.

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

As verbs, suppress is a hypernym of quieten; that is, suppress is a word with a broader meaning than quieten:

Other hypernyms of quieten include conquer, stamp down, subdue.

quieten (verb)	suppress (verb)
cause to be quiet or not talk	bring under control by force or authority
make calm or still	lessen to the point of stopping
become quiet or quieter	put out of one's consciousness
	consciously restrain from showing; of emotions, desires, impulses, or behavior
	come down on or keep down by unjust use of one's authority