calm down vs pacify

calm down and pacify both are verbs.

Word	Noun	Adjective	Verb	Adverb
calm down	No	No	Yes	No
pacify	No	No	Yes	No

As verbs, pacify is a hyponym of calm down; that is, pacify is a word with a more specific, narrower meaning than calm down:

Other hyponyms of calm down include lull, compose, appease, assuage, conciliate, gentle, gruntle, lenify, mollify, placate.

calm down (verb)	pacify (verb)
become quiet or less intensive	fight violence and try to establish peace in (a location)
make calm or still	cause to be more favorably inclined; gain the good will of
become quiet or calm, especially after a state of agitation