unwind vs unbend

unwind and unbend both are verbs.

Word	Noun	Adjective	Verb	Adverb
unwind	No	No	Yes	No
unbend	No	No	Yes	No

As verbs, unwind and unbend are synonyms defined as:

Other synonyms of unwind include decompress, loosen up, relax, slow down.

As verbs, unbend is a hyponym of unwind; that is, unbend is a word with a more specific, narrower meaning than unwind:

unwind (verb)	unbend (verb)
become less tense, rest, or take one's ease	release from mental strain, tension, or formality
cause to feel relaxed	become less tense, rest, or take one's ease
separate the tangles of	make less taut
reverse the winding or twisting of	free from flexure
	unfasten, as a sail, from a spar or a stay
	straighten up or out; make straight