still vs placate

still is a noun but placate is not a noun.

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

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

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

still (noun)	placate (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

still (adjective)	placate (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

still (verb)	placate (verb)
cause to be quiet or not talk	cause to be more favorably inclined; gain the good will of
make motionless
make calm or still
lessen the intensity of or calm

still (adverb)	placate (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)