quieten vs placate

quieten and placate both are verbs.

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

As verbs, placate is a hyponym of quieten; that is, placate is a word with a more specific, narrower meaning than quieten:

Other hyponyms of quieten include lull, compose, appease, assuage, conciliate, gentle, gruntle, lenify, mollify, pacify.

quieten (verb)	placate (verb)
cause to be quiet or not talk	cause to be more favorably inclined; gain the good will of
make calm or still
become quiet or quieter