Hey vs Look sir

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

Hey

InformalTop 1,000 (very common)A1exclamation

Look sir

Beyond 10,000 (less common)
Most formal: Look sirMost common: Hey
 HeyLook sir
Pronunciation🇬🇧 /["/heɪ/"]/🇺🇸 /["/heɪ/"]/🇬🇧 //lʊk sɜːr//🇺🇸 //lʊk sɜr//
MeaningA casual greeting used to say hello.A way to get someone's attention or show something.
ExampleHey, can I just ask you something?Look, sir, I have found the missing document!
RegisterInformalNeutral
How commonTop 1,000 (very common)Beyond 10,000 (less common)
CEFR levelA1-
Part of speechexclamation
Collocationssay hey, hey there, hey buddy, hey dudelook closely, look over there, look and see
Antonymsgoodbye, farewell, bye-
Common mistakesUsing 'hey' in formal emails or letters., Spelling it as 'hay' when greeting someone.Used in inappropriate contexts, like formal meetings., Omitting 'sir' when addressing someone formally., Overusing in informal settings, causing it to sound disrespectful.
Usage notesPrimarily used in informal situations among friends or acquaintances. It's less appropriate in formal contexts or professional settings. Avoid using it with people you don't know well.Used when you want to draw someone's attention, usually followed by showing something. Generally polite, but context may determine formality.

See it in real clips

Hey
Look sir

Frequently asked questions: Hey vs Look sir

What's the difference between Hey and Look sir?

Hey: A casual greeting used to say hello. Look sir: A way to get someone's attention or show something.

Which is more formal: Hey and Look sir?

Look sir is the most formal of these.

Which is more common: Hey and Look sir?

Hey is the most common in everyday English.

Can you show an example of each?

Hey: Hey, can I just ask you something? Look sir: Look, sir, I have found the missing document!

Can I use Hey and Look sir interchangeably?

Not always. Hey and Look sir 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.

Related comparisons