How to say "security" in Japanese

• セキュリティCommon
  nounCovers security as protective measures against threats — safeguarding buildings, information systems, or people from crime, intrusion, or attack. This katakana loanword is the natural choice for that sense.
  Windows Vistaのセキュリティ機能きのうを迂回うかいする方法ほうほうを研究者けんきゅうしゃが公表こうひょうします。↗

  Researchers announce method of circumventing Windows Vista security features.
• 安全あんぜんJLPT N4approx.Common
  noun, na-adjectiveThe word for being safe and free from danger or risk. Choose it when 'security' means that state of safety rather than the measures taken to protect something.
  君きみは自分じぶんの安全あんぜんにもっと気きを配くばるべきだ。↗

  You should be more thoughtful of your safety.
• 無事ぶじJLPT N3approx.Common
  noun, na-adjectiveDescribes a person or thing being safe and sound, unharmed after danger or a journey. It is seldom the word you want for 'security' in the sense of protective measures.
  彼かれの無事ぶじを知しらされて、部長ぶちょうは安堵あんどのため息いきをついた。↗

  Informed of his safety, the manager breathed a sigh of relief.
• 保証ほしょうJLPT N3approx.Common
  noun, suru verb, transitive verbReally means guarantee or assurance — a pledge that something will be done or is true. As 'security' it fits only the sense of a guarantee or surety behind an obligation, not protection from danger.
  彼女かのじょの誠実せいじつさは私が保証ほしょうします。↗

  You have my word on her sincerity.
• 担保たんぽCommon
  nounThe financial and legal term: security in the sense of collateral — property or assets pledged to back a loan or debt. It has nothing to do with personal safety.
  家いえを担保たんぽにお金かねを借かりよう。↗

  We'll use the house as collateral so we can borrow some money.

Use 「セキュリティ」 for protective measures against threats such as crime or hacking, 安全 for freedom from danger, 無事 for being safe and unharmed, 保証 for guarantees, and 担保 for financial collateral.

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

• セキュリティsecurity
• 安全あんぜんsafety
• 無事ぶじsafety
• 保証ほしょうguarantee
• 担保たんぽsecurity
• 安保あんぽsecurity (e.g. national security)
• 安泰あんたいsecurity
• 保安ほあんpeace preservation
• 抵当ていとうmortgage
• 機密保護きみつほごsecurity (e.g. data, password, etc.)
• 引当ひきあてmortgage
• 証券しょうけんbond
• 警備けいびdefense
• 裏付けうらづけsupport (e.g. for an argument)
• 安全保護あんぜんほごsecurity
• 安全性あんぜんせいsafety
• 安定性あんていせいstability
• 保安係ほあんがかりstore (house) detective
• 担保物件たんぽぶっけんcollateral
• 安心あんしんpeace of mind
• 安全保障あんぜんほしょう(guarantee of) security
• 防犯ぼうはんsecurity (device, camera, etc.)
• 銘柄めいがらtrading name (on a stock exchange)
• 見返りみかえりcollateral
• 形かたsecurity
• 質しちpledge