untangle vs undo

untangle and undo both are verbs.

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

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

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

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