Synonyms for Blockade:

n.

export, balance of payments, common market, embargo, balance of trade. beleaguerment, attack, siege, Besiegement, investment. act (noun)
encirclement.
barricade (noun)
siege.
barrier (noun)
siege, clog, restriction, impediment, stoppage, obstruction, bar, stop, snag, encirclement, barricade, hindrance, obstacle.
blockade (noun)
block off, barricade, embarrass, stymie, block up, bar, obstruct, seal off, hinder, stymy, encirclement, block.
closure (noun)
bung.
exclusion (noun)
refusal.
hindrance (noun)
delay, congestion, constipation, damper, obstacle, catch, tangle, stop, handicap, burden, opposition, obstruction, stay, impediment, constraint, disadvantage, blockage, inhibition, barrier, restraint, snag, hurdle, restriction, entrapment, mire, hindrance, encumbrance, frustration, bung, drawback, impasse, crimp, interruption, choke, dam, clog, snarl, bafflement, jam, brake, stoppage, drag, deterrent, plug, block, entanglement, resistance, impedance, complication, bottleneck.
prohibition (noun)
denial, preclusion, prevention, forbiddance, ban, bar, Disallowance, prohibition, rejection, suppression, curtailment, refusal, disapproval, injunction.

v.

social (verb)
embarrass, stymy, obstruct, stymie, hinder, block.

Other synonyms:

balance of trade, beleaguerment, embargo, Besiegement, common market, balance of payments. export, siege, investment. beleaguer
siege.
enclose
block off.
Other relevant words:
embargo, obstruct, Besiegement, encirclement, export, block off, investment, hinder, barricade, attack, embarrass, beleaguerment, stymie, seal off, siege, block up, stymy.

Usage examples for blockade

  1. The immediate return of the latter to the westward was dictated by reasons, already given in his own words, the weight of which he doubtless felt more forcibly because he found himself actually so far away from the centre of the blockade and from his base at Key West. – Lessons of the war with Spain and other articles by Alfred T. Mahan
  2. Important as was the blockade service, it was of a character safely to be trusted to a subordinate; whereas the strictly military operations of the approaching campaign, whatever shape they might finally take, would be for the control of the river. – Admiral Farragut by A. T. Mahan
  3. Those which had escaped capture as blockade runners had been subsequently destroyed or were worn out.. – The Sequel of Appomattox A Chronicle of the Reunion of the States, Volume 32 In The Chronicles Of America Series by Walter Lynwood Fleming