unravel vs undo

unravel and undo both are verbs.

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

As verbs, undo is a hypernym of unravel; that is, undo is a word with a broader meaning than unravel:

unravel: become or cause to become undone by separating the fibers or threads of
undo: cancel, annul, or reverse an action or its effect

unravel (verb)	undo (verb)
become undone	cancel, annul, or reverse an action or its effect
become or cause to become undone by separating the fibers or threads of	cause to become loose
disentangle	remove the outer cover or wrapping of
	deprive of certain characteristics
	cause the ruin or downfall of