obstructor vs blockade

obstructor and blockade both are nouns.

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

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

obstructor (noun)	blockade (noun)
any structure that makes progress difficult	a war measure that isolates some area of importance to the enemy
someone who systematically obstructs some action that others want to take	prevents access or progress

obstructor (verb)	blockade (verb)
	impose a blockade on
	obstruct access to
	render unsuitable for passage
	hinder or prevent the progress or accomplishment of