How to say "force" in Japanese

Choosing the right word
  • 力ちからJLPT N4approx.Common
    nounForce as strength, might or vigour — physical power such as the force of a blow or the strength in one's arms. When 'force' means power or strength, this is the word you want.
    あなたは私の2倍ばいの力ちからがある。↗
    You are twice as strong as I.
  • 勢いいきおいJLPT N3approx.Common
    nounForce as momentum, impetus or driving energy — the force of a wave, a rushing crowd or a fast-growing trend. It suggests something in motion or on the rise, rather than strength at rest.
    あらしの勢いきおいが弱よわまった。↗
    The storm abated.
  • 部隊ぶたいCommon
    nounHere 'force' means a military body of troops — a unit, corps or squad. It is the word for an organized fighting force, not for strength, energy or coercion.
    その大尉たいいはうまく部隊ぶたいを指揮しきしている。↗
    That captain handles his troops well.
  • nounThe katakana borrowing of the English word. For force as strength, momentum, a military unit or compulsion, use 力, 勢い, 部隊 or 強いる instead; フォース is seldom the word for these senses.
  • 強いるしいるJLPT N1approx.Common
    ichidan verb, transitive verbThe verb 'to force' in the sense of compelling or coercing someone — pressing them into something, often against their will. Use it when 'force' means to compel, not for the noun senses.
    彼かれらは我々われわれに服従ふくじゅうを強しいた。↗
    They enforced obedience upon us.

Use 力 for force as strength or power, 「勢い」 for momentum or driving energy, 部隊 for a military force, and 「強いる」 for forcing or compelling someone; 「フォース」 is the katakana borrowing, rarely the right choice for these senses.

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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