Energy vs Strength

When to use each in English, with meaning, register, and examples.

Energy

Top 1,000 (very common)A2noun

Strength

Top 1,000 (very common)B1noun
 EnergyStrength
Pronunciation🇬🇧 /["/ˈenədʒi/"]/🇺🇸 /["/ˈenərdʒi/"]/🇬🇧 /["/streŋkθ/"]/🇺🇸 /["/streŋkθ/"]/
MeaningThe ability to do work or cause change; a source of power.The ability to be strong or powerful.
ExampleI need a lot of energy to run a marathon.Her strength helped her lift the heavy box with ease.
RegisterNeutralNeutral
How commonTop 1,000 (very common)Top 1,000 (very common)
CEFR levelA2B1
Part of speechnounnoun
Collocationsboundless, endless, inexhaustible, amount, level, great deal, be bursting with, be full of, have, flag, dissipate, drain away, level, reserves, bar, energy and enthusiasm, an outlet for your energy, time or energy, alternative, clean, green, amount, generate, produce, harness, production, consumption, use, a demand for energy, a form of energy, a source of energyconsiderable, enormous, great, have, possess, lack, grow, increase, decline, up to strength, below strength, under strength, at full strength, back to full strength, every ounce of strength, considerable, enormous, great, have, possess, lack, grow, increase, decline, up to strength, below strength, under strength, at full strength, back to full strength, every ounce of strength, considerable, enormous, great, have, possess, lack, grow, increase, decline, up to strength, below strength, under strength, at full strength, back to full strength, every ounce of strength, considerable, enormous, great, have, possess, lack, grow, increase, decline, up to strength, below strength, under strength, at full strength, back to full strength, every ounce of strength, considerable, enormous, great, have, possess, lack, grow, increase, decline, up to strength, below strength, under strength, at full strength, back to full strength, every ounce of strength, great, real, individual, capitalize on, exploit, play to, come from something, lie in something, strengths and weaknesses, considerable, enormous, great, have, possess, lack, grow, increase, decline, up to strength, below strength, under strength, at full strength, back to full strength, every ounce of strength
Antonymslethargy, exhaustion, tirednessweakness, frailty
Common mistakesConfused with 'energies' when talking about different types of power., Using 'energy' as an uncountable noun incorrectly in some contexts., Mistakenly using it to describe emotions instead of physical power.Confused with 'strong', which is an adjective., Using 'strengths' when referring to good qualities or skills, but should specify context., May forget to use in plural form where applicable (e.g., 'strengths' for multiple qualities).
Usage notesUsed in many contexts, including physics, health, and daily life. Generally appropriate in both casual and formal settings, but may be too technical in very informal conversations.Used when talking about physical power, mental resilience, or overall capacity. In formal contexts, it might refer to both human and material strength. Avoid using in very casual conversations where simpler words like 'power' may suffice.

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Energy
Strength

Frequently asked questions: Energy vs Strength

What's the difference between Energy and Strength?

Energy: The ability to do work or cause change; a source of power. Strength: The ability to be strong or powerful.

Which is more advanced: Energy and Strength?

Strength is the highest level, at B1, on the CEFR scale.

Are Energy and Strength the same CEFR level?

Energy: A2, Strength: B1 on the CEFR scale.

What part of speech are Energy and Strength?

Energy: noun, Strength: noun.

Can you show an example of each?

Energy: I need a lot of energy to run a marathon. Strength: Her strength helped her lift the heavy box with ease.

Can I use Energy and Strength interchangeably?

Not always. Energy and Strength are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

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