Agency vs Capacity

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

Agency

Top 2,000 (common)B2noun

Capacity

Top 2,000 (common)B2noun
 AgencyCapacity
Pronunciation🇬🇧 /["/ˈeɪdʒənsi/"]/🇺🇸 /["/ˈeɪdʒənsi/"]/🇬🇧 //kəˈpæs.ɪ.ti//🇺🇸 //kəˈpæ.sɪ.ti//
MeaningThe ability to make choices and take action.How much something can hold or do.
ExampleShe works for an **advertising agency**.The capacity of the stadium is 50,000 people.
RegisterNeutralNeutral
How commonTop 2,000 (common)Top 2,000 (common)
CEFR levelB2B2
Part of speechnounnoun
Collocationsofficial, federal, government, through an/​the agency, official, federal, government, through an/​the agencyfull capacity, seating capacity, at capacity, capacity limits
Antonymspowerlessness, ineffectivenessinability, incapacity
Common mistakesConfused with 'agencies' as only organizations; forgets personal meaning., Using 'agency' in plural when referring to the concept of choice., Misunderstanding 'agency' as a physical place only.Confused with 'capability', which refers to ability rather than volume., Using 'capacity' for individual abilities when 'capability' is more appropriate., Mispronouncing the word with emphasis on the wrong syllable.
Usage notesUsed in contexts related to control and decision-making. Can refer to organizations (like an agency) or personal autonomy. Avoid when discussing only organizations.Used in both formal and informal contexts. Common in discussions about limits or ability. Not typically used in casual conversation unless referring to space or limits.

Frequently asked questions: Agency vs Capacity

What's the difference between Agency and Capacity?

Agency: The ability to make choices and take action. Capacity: How much something can hold or do.

Are Agency and Capacity the same CEFR level?

Agency: B2, Capacity: B2 on the CEFR scale.

Can I use Agency and Capacity interchangeably?

Not always. Agency and Capacity 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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