Operation vs Surgery

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

Operation

Top 2,000 (common)B1noun

Surgery

Top 1,000 (very common)B2noun
Most common: Surgery
 OperationSurgery
Pronunciation🇬🇧 /["/ˌɒpəˈreɪʃn/"]/🇺🇸 /["/ˌɑːpəˈreɪʃn/"]/🇬🇧 /["/ˈsɜːdʒəri/"]/🇺🇸 /["/ˈsɜːrdʒəri/"]/
MeaningA task or activity that is done to achieve a goal.A medical operation to fix or remove something in the body.
ExampleThe operation was scheduled for early morning.The patient underwent surgery to remove the tumor.
RegisterNeutralNeutral
How commonTop 2,000 (common)Top 1,000 (very common)
CEFR levelB1B2
Part of speechnounnoun
Collocationsmajor, minor, small, have, undergo, come through, during a/​the operation, operation for, operation on, big, large-scale, major, begin, launch, mount, during a/​the operation, a theatre/​theater of operations, big, large-scale, major, begin, launch, mount, during a/​the operation, a theatre/​theater of operations, big, large-scale, major, begin, launch, mount, during a/​the operation, a theatre/​theater of operations, effective, efficient, smooth, come into, bring something into, put something into, during operation, in operation, in full operation, into full operation, big, large-scale, major, begin, launch, mount, during a/​the operation, a theatre/​theater of operationsmajor, radical, minor, get, have, undergo, after surgery, before surgery, during surgery, open, afternoon, evening, do, have, hold, hours, in a/​the surgery, open, afternoon, evening, do, have, hold, hours, in a/​the surgery
Antonymsdisruption, inactionconvalescence, healing
Common mistakes'Operation' used incorrectly to mean 'operation table' or 'operation room'., Confused with 'operation' as a synonym for 'procedure' in informal settings., Omitting the noun that follows 'operation', e.g., saying 'operation is' instead of 'operation of machinery is'.Confused with 'surgical' which refers to things related to surgery., Using 'surgery' when they mean to refer to a doctor's appointment or consultation., Misunderstanding the difference between 'surgery' and 'operation', which can be used interchangeably in many contexts.
Usage notesUsed in various contexts such as business, military, and mathematics. It may seem too formal for casual conversation.Use 'surgery' when discussing medical procedures; it is neutral and suitable for both formal and informal contexts. Avoid using it in casual conversations that don't concern health.

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Operation

Frequently asked questions: Operation vs Surgery

What's the difference between Operation and Surgery?

Operation: A task or activity that is done to achieve a goal. Surgery: A medical operation to fix or remove something in the body.

Which is more common: Operation and Surgery?

Surgery is the most common in everyday English.

Which is more advanced: Operation and Surgery?

Surgery is the highest level, at B2, on the CEFR scale.

Are Operation and Surgery the same CEFR level?

Operation: B1, Surgery: B2 on the CEFR scale.

What part of speech are Operation and Surgery?

Operation: noun, Surgery: noun.

Can you show an example of each?

Operation: The operation was scheduled for early morning. Surgery: The patient underwent surgery to remove the tumor.

Can I use Operation and Surgery interchangeably?

Not always. Operation and Surgery 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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