derail vs weaken

derail and weaken both are verbs.

Word	Noun	Adjective	Verb	Adverb
derail	No	No	Yes	No
weaken	No	No	Yes	No

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

Other hypernyms of derail include counteract, countermine, sabotage, subvert, undermine.

derail (verb)	weaken (verb)
run off or leave the rails	become weaker
cause to run off the tracks	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