unstrap vs undo

unstrap and undo both are verbs.

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

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

unstrap (verb)	undo (verb)
remove the strap or straps from	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