slacken vs weaken

slacken and weaken both are verbs.

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

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

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

slacken (verb)	weaken (verb)
become looser or slack	become weaker
make slack as by lessening tension or firmness	lessen the strength of
become slow or slower	reduce the level or intensity or size or scope of
make less active or fast	lessen in force or effect
	destroy property or hinder normal operations