力|りょくryoku[1]atamadaka (head-high)

1. suffixstrength; power; proficiency; ability

• Synonym勢いいきおいNeutralMomentum or impetus, as in 「勢いよく走る」; a dynamic, moving force rather than static strength.
• RelatedエナジーNeutralLoanword for energy, seen mostly in drink advertising like 「エナジードリンク」; it does not refer to physical strength.
• RelatedバイタリティNeutralLoanword for abundant vitality, stressing a person's energetic, vigorous character rather than strength or power.
• Related威力いりょくNeutralImpressive power or might, as in 「爆発の威力」; stresses destructive force or strong influence.
• Related元気げんきNeutralGood health and high spirits; describes a person's physical and mental condition, not strength or power.
• Related活気かっきNeutralLiveliness of a place or scene, as in 「活気のある街」; it is about atmosphere, not personal strength.
• Related意気いきNeutralFighting spirit or mettle, mostly in set phrases like 「意気込み」 and 「意気投合」; about drive, not power.
• Related気勢きせいNeutralMomentum or fervour, as in 「気勢を上げる」; typically the swelling energy of a group rather than individual strength.
• Related生気せいきNeutralVitality showing in a face or look, as in 「生気のない顔」; concerns spirit and complexion, not force.
• RelatedアビリティーNeutralLoanword for ability, used mainly in gaming and HR contexts; in everyday speech 「能力」 is the normal choice.
• Antonym無力むりょくNeutralPowerlessness or helplessness, the opposite of 「力」, as in 「無力感」.
• Antonym弱さよわさNeutralWeakness, the direct opposite of having power, as in 「心の弱さ」.

As a suffix, 「〜力」 builds words for ability or effectiveness, as in 「影響力」「想像力」「経済力」. Say 「元気」 for good spirits and health, 「勢い」 for momentum, and 「威力」 for might or destructive force.

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

1. （りょく）～力ちから:働はたらきかけることができる機能きのうや抽象ちゅうしょう概念がいねんの大おおきさ。影響えいきょうを及およぼすことができる度合どあい。
2. （りょく）～力ちから:働はたらきかけるしくみを利用りようしていること。