circumvent vs blockade

circumvent is not a noun while blockade is a noun.

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

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

Other hyponyms of circumvent include seal off, ebb.

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

circumvent (verb)	blockade (verb)
avoid or try to avoid fulfilling, answering, or performing (duties, questions, or issues)	impose a blockade on
beat through cleverness and wit	obstruct access to
surround so as to force to give up	render unsuitable for passage
	hinder or prevent the progress or accomplishment of