How to say "blockade" in Japanese

• 封鎖ふうさJLPT N1approx.Common
  noun, suru verb, transitive verbThe word for a blockade proper: sealing off an area so people and goods cannot get in or out, as in a military blockade or the lockdown of a city or region.
  この港みなとは封鎖ふうさされうる。↗

  The harbor can be blocked.
• 遮断しゃだんCommon
  noun, suru verb, transitive verbCenters on cutting something off — a road, a supply line, communication — leaving a place isolated or quarantined. Use it when the emphasis falls on the severing itself rather than on sealing off an area.
  がけくずれで交通こうつうは遮断しゃだんされた。↗

  Traffic was blocked by a landslide.
• 閉塞へいそくCommon
  noun, suru verb, transitive verb, intransitive verbReally means blockage or stoppage — a passage or channel being blocked up — and is only marginally used for 'blockade'. For a deliberate blockade of an area this is seldom the word you want.

Use 封鎖 for a blockade in the sense of sealing off an area or lockdown; 遮断 for cutting off access, supplies or contact; 閉塞 is really about blockage or stoppage, seldom a blockade as such.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 封鎖ふうさblockade
• 遮断しゃだんisolation
• 閉塞へいそくblockage