de-escalate vs diminish

de-escalate and diminish both are verbs.

Word	Noun	Adjective	Verb	Adverb
de-escalate	No	No	Yes	No
diminish	No	No	Yes	No

As verbs, diminish is a hypernym of de-escalate; that is, diminish is a word with a broader meaning than de-escalate:

Other hypernyms of de-escalate include decrease, fall, lessen.

de-escalate (verb)	diminish (verb)
reduce the level or intensity or size or scope of	decrease in size, extent, or range
diminish in size, scope, or intensity	lessen the authority, dignity, or reputation of