undo vs unravel

undo and unravel both are verbs.

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

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

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

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