undo vs unpick

undo and unpick both are verbs.

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

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

undo (verb)	unpick (verb)
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	undo (the stitches) of (a piece of sewing)
remove the outer cover or wrapping of
deprive of certain characteristics
cause the ruin or downfall of