derogate vs talk down

derogate and talk down both are verbs.

Word	Noun	Adjective	Verb	Adverb
derogate	No	No	Yes	No
talk down	No	No	Yes	No

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

derogate (verb)	talk down (verb)
cause to seem less serious; play down	belittle through talk
	speak in a condescending manner, as if to a child
	direct and control (the flight of an airplane during landing) via radio