straighten vs unwind

straighten and unwind both are verbs.

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

As verbs, unwind is a hypernym of straighten; that is, unwind is a word with a broader meaning than straighten:

Other hypernyms of straighten include disentangle.

straighten (verb)	unwind (verb)
put (things or places) in order	become less tense, rest, or take one's ease
make straight or straighter	cause to feel relaxed
make straight	separate the tangles of
straighten by unrolling	reverse the winding or twisting of
straighten up or out; make straight
get up from a sitting or slouching position