besiege vs blockade

besiege is not a noun while blockade is a noun.

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

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

Other hyponyms of besiege include seal off, ebb.

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

besiege (verb)	blockade (verb)
harass, as with questions or requests	impose a blockade on
surround so as to force to give up	obstruct access to
cause to feel distressed or worried	render unsuitable for passage
	hinder or prevent the progress or accomplishment of