de-energise vs weaken

de-energise and weaken both are verbs.

Word	Noun	Adjective	Verb	Adverb
de-energise	No	No	Yes	No
weaken	No	No	Yes	No

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

de-energise (verb)	weaken (verb)
deprive of energy	become weaker
	lessen the strength of
	reduce the level or intensity or size or scope of
	lessen in force or effect
	destroy property or hinder normal operations