hem in vs blockade

hem in is not a noun while blockade is a noun.

Word	Noun	Adjective	Verb	Adverb
hem in	No	No	Yes	No
blockade	Yes	No	Yes	No

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

Other hyponyms of hem in include seal off, ebb.

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

hem in (verb)	blockade (verb)
surround so as to force to give up	impose a blockade on
surround in a restrictive manner	obstruct access to
	render unsuitable for passage
	hinder or prevent the progress or accomplishment of