unhitch vs undo

unhitch and undo both are verbs.

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

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

unhitch (verb)	undo (verb)
unfasten or release from or as if from a hitch	cancel, annul, or reverse an action or its effect
	cause to become loose
	remove the outer cover or wrapping of
	deprive of certain characteristics
	cause the ruin or downfall of