military blockade vs siege

military blockade and siege both are nouns.

Word	Noun	Adjective	Verb	Adverb
military blockade	Yes	No	No	No
siege	Yes	No	No	No

As nouns, military blockade and siege are synonyms defined as:

military blockade and siege: the action of an armed force that surrounds a fortified place and isolates it while continuing to attack

Other synonyms of military blockade include beleaguering, besieging.

military blockade (noun)	siege (noun)
the action of an armed force that surrounds a fortified place and isolates it while continuing to attack	the action of an armed force that surrounds a fortified place and isolates it while continuing to attack