close up vs blockade

close up is not a noun while blockade is a noun.

Word	Noun	Adjective	Verb	Adverb
close up	No	No	Yes	Yes
blockade	Yes	No	Yes	No

As verbs, blockade is a hyponym of close up; that is, blockade is a word with a more specific, narrower meaning than close up:

close up (noun)	blockade (noun)
	a war measure that isolates some area of importance to the enemy
	prevents access or progress

close up (verb)	blockade (verb)
refuse to talk or stop talking; fall silent	impose a blockade on
block passage through	obstruct access to
unite or bring into contact or bring together the edges of	render unsuitable for passage
cease to operate or cause to cease operating	hinder or prevent the progress or accomplishment of

close up (adverb)	blockade (adverb)
very close