blockade vs impediment

blockade and impediment both are nouns.

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

As nouns, impediment is a hypernym of blockade; that is, impediment is a word with a broader meaning than blockade:

Other hypernyms of blockade include impedimenta, obstructer, obstruction, obstructor.

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

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