relax vs weaken

relax and weaken both are verbs.

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

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

relax (verb)	weaken (verb)
become less tense, rest, or take one's ease	become weaker
cause to feel relaxed	lessen the strength of
make less taut	reduce the level or intensity or size or scope of
become loose or looser or less tight	lessen in force or effect
make less active or fast	destroy property or hinder normal operations
become less severe or strict
make less severe or strict
become less tense, less formal, or less restrained, and assume a friendlier manner