How to say "havoc" in Japanese

• 惨害さんがい
  nounCovers the destruction side of 'havoc': heavy damage and ravages, the kind left by a storm, war, or similar disaster. A less common choice; think 'wreaked devastation' rather than mere disorder.
• 大混乱だいこんらん
  nounCovers 'havoc' as chaos: pandemonium and turmoil, not physical damage — plans, traffic, or meetings thrown into utter confusion. A less common choice; reach for it when disorder, not destruction, is meant.
  通とおりは大だい混乱こんらんだった。↗

  The street was in utter chaos.

For 'havoc' as widespread physical destruction use 惨害; for 'havoc' as utter confusion and disorder use 大混乱; both are less common renderings of the English word.

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

• 惨害さんがいheavy damage
• 大混乱だいこんらんchaos