How to say "strength" in Japanese

• 力ちからJLPT N4approx.Common
  nounThe basic word for strength as physical power or force — the strength to lift, push, or fight — and by extension might and vigour; this is what you want for a person's or animal's strength.
  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.
• 強度きょうどCommon
  nounStrength in the technical, measurable sense — how strong a material, structure, or physical phenomenon is — and intensity; not the word for a person's strength.
  この金属きんぞくは強度きょうどでは鉄てつに匹敵ひってきする。↗

  This metal is comparable to iron in strength.
• 強さつよさCommon
  nounStrength as a quality or degree: how strong a person, team, drink, or signal is. Use it when comparing or measuring strength rather than naming a force.
• 力りょくCommon
  suffixThe same character read りょく, met almost entirely inside compounds with senses of power, ability, or proficiency; it is not used on its own, so it is seldom the word you want for 'strength'.
• 勢力せいりょくJLPT N1approx.Common
  nounPower, might, and strength in the sense of a group's or force's clout — the influence and reach of a party, faction, or movement; not for personal physical strength.
  地球ちきゅう側がわの圧政あっせいに苦くるしむコロニーの人々ひとびとの中なかで、テロによる現状げんじょう打破だはを目論もくろむ勢力せいりょくが誕生たんじょう。↗

  Among the people of the colonies suffering under Earth's tyranny a force emerges intending to overthrow the status quo through terrorism.

For physical strength or power use 力（ちから）; for degree of strength use 「強さ」; for measurable strength of materials or intensity use 強度; for a group's power and influence use 勢力; 力（りょく） is confined to compounds.

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

• 力ちからforce
• 強度きょうどstrength
• 強さつよさstrength
• 力りょくstrength
• 勢力せいりょくinfluence
• 迫力はくりょくimpressiveness
• 特長とくちょうstrong point
• 力りきstrength
• 壮そうvibrancy
• 剛ごうstrength
• マッスルmuscle
• ストレングスstrength
• 剛強ごうきょうstrength
• 勢せいstrength
• 売りどころうりどころselling point
• 強弱きょうじゃくstrength and weakness
• 度どstrength (of glasses)
• 体力たいりょくstrength (of a business, economy, etc.)
• エネルギーenergy
• 精せいenergy
• 度数どすうdegree (e.g. temperature)
• 英気えいきstrength (to face something)
• 馬力ばりきenergy
• 強きょうstrength
• 張りはりresilience (e.g. of hair)
• 腕うで(physical) strength