unstuff vs unblock

unstuff and unblock both are verbs.

Word	Noun	Adjective	Verb	Adverb
unstuff	No	No	Yes	No
unblock	No	No	Yes	No

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

unstuff (verb)	unblock (verb)
cause to become unblocked	make (assets) available
	play the cards of (a suit) so that the last trick on which a hand can follow suit will be taken by a higher card in the hand of a partner who has the remaining cards of a combined holding
	clear or remove an obstruction from