Function vs Operate

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

Function

Top 1,000 (very common)B1noun

Operate

Top 1,000 (very common)B2verb
 FunctionOperate
Pronunciation🇬🇧 /["/ˈfʌŋkʃn/"]/🇺🇸 /["/ˈfʌŋkʃn/"]/🇬🇧 /["/ˈɒpəreɪt/","/ˈɒpəreɪts/","/ˈɒpəreɪtɪd/","/ˈɒpəreɪtɪŋ/"]/🇺🇸 /["/ˈɑːpəreɪt/","/ˈɑːpəreɪts/","/ˈɑːpəreɪtɪd/","/ˈɑːpəreɪtɪŋ/"]/
MeaningWhat something does or is used for.To control or work something.
ExampleThe main function of the heart is to pump blood throughout the body.The company will operate several new routes starting next month.
RegisterNeutralNeutral
How commonTop 1,000 (very common)Top 1,000 (very common)
CEFR levelB1B2
Part of speechnounverb
Collocationsimportant, useful, valuable, have, carry out, fulfil/​fulfill, charity, official, social, hold, attend, go to, roomeffectively, efficiently, reliably, be designed to, be easy to
Antonymsdysfunction, malfunctioncease, stop, halt
Common mistakes'Function' is confused with 'functional' — they are different., Using 'function' when 'purpose' is more appropriate., Incorrectly pluralizing 'function' when referring to it in general terms.Confused with 'operate on' which refers to performing surgery., Using 'operate' incorrectly with inanimate objects when 'function' is more suitable., Omitting the object, e.g., saying 'I operate' instead of 'I operate the machine.'
Usage notesUse 'function' when discussing what something is supposed to do. It's appropriate in technical, academic, or everyday contexts, but avoid it in very casual conversations.Use 'operate' when referring to machines, systems, or processes. It's neutral and appropriate in both formal and informal contexts, but avoid using it in very casual conversations.

Frequently asked questions: Function vs Operate

What's the difference between Function and Operate?

Function: What something does or is used for. Operate: To control or work something.

Are Function and Operate the same CEFR level?

Function: B1, Operate: B2 on the CEFR scale.

Can I use Function and Operate interchangeably?

Not always. Function and Operate 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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