How to say "defense" in Japanese

Choosing the right word
  • 防御ぼうぎょCommon
    noun, suru verb, transitive verbDefense as warding off attack or harm in general, from enemy assault to disease; it also carries the nuance of protection and safeguarding.
    その市しの防御ぼうぎょは堅固けんごだ。↗
    The defenses of the city are strong.
  • 防衛ぼうえいJLPT N1approx.Common
    noun, suru verb, transitive verbDefense against outside attack, especially the defense of a nation: this is the word for national defense and for protecting a country or organization from external threats.
    The outlook for the defense program is dismal.
  • 弁護べんごJLPT N1approx.Common
    noun, suru verb, transitive verbThe legal sense: defending an accused person in court, pleading or arguing on their behalf; it also covers speaking up in defense of a person or their actions.
    まことにすみませんが、私のために弁護べんごしていただけませんか。↗
    Would you be kind enough to put in a word for me?
  • 警備けいびJLPT N2approx.Common
    noun, suru verb, transitive verbDefense in the sense of guarding and security: policing a building, event, or area to keep it safe. It is the word for 'defense' as security work, not for military or legal defense.
    500 policemen were put on strict alert.
  • 守備しゅびJLPT N1approx.Common
    suru verb, transitive verb, no-adjectiveDefense in sports and games: the defensive side of play, such as fielding in baseball or defending one's goal. It can also mean the guarding of a position or place.

Pick by sense: 防御 for warding off attack or harm in general, 防衛 for defending a country against outside threats, 弁護 for legal defense, 警備 for security guarding, and 守備 for defense in sports and games.

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

Japanese equivalents
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JLPT vocabulary levels are community estimates, not official (no official lists have been published since the 2010 revision).

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