obstruct vs blockade

obstruct is not a noun while blockade is a noun.

Word	Noun	Adjective	Verb	Adverb
obstruct	No	No	Yes	No
blockade	Yes	No	Yes	No

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

As verbs, obstruct and blockade are synonyms defined as:

obstruct and blockade: hinder or prevent the progress or accomplishment of

Other synonyms of obstruct include block, embarrass, hinder, stymie, stymy.

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

obstruct (verb)	blockade (verb)
block passage through	impose a blockade on
shut out from view or get in the way so as to hide from sight	obstruct access to
hinder or prevent the progress or accomplishment of	render unsuitable for passage
	hinder or prevent the progress or accomplishment of