impediment vs blockade

impediment and blockade both are nouns.

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

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

impediment (noun)	blockade (noun)
any structure that makes progress difficult	a war measure that isolates some area of importance to the enemy
something immaterial that interferes with or delays action or progress	prevents access or progress

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