undo vs unwind

undo and unwind both are verbs.

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

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

undo (verb)	unwind (verb)
cancel, annul, or reverse an action or its effect	become less tense, rest, or take one's ease
cause to become loose	cause to feel relaxed
remove the outer cover or wrapping of	separate the tangles of
deprive of certain characteristics	reverse the winding or twisting of
cause the ruin or downfall of