Client vs Customer

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

Client

Top 2,000 (common)B1noun

Customer

Top 1,000 (very common)A1noun
Most common: Customer
 ClientCustomer
Pronunciation🇬🇧 //ˈklaɪənt//🇺🇸 //ˈklaɪənt//🇬🇧 /["/ˈkʌstəmə(r)/"]/🇺🇸 /["/ˈkʌstəmər/"]/
MeaningA person or company that buys services.A person who buys goods or services.
ExampleThe consultant presented her ideas to the client.The customer returned the item because it was defective.
RegisterNeutralNeutral
How commonTop 2,000 (common)Top 1,000 (very common)
CEFR levelB1A1
Part of speechnounnoun
Collocationsnew client, potential client, client relationship, client servicesbig, favoured/​favored, favourite/​favorite, have, deal with, help, care, relations, relationship
Antonymsprovider, vendor, supplierseller, vendor
Common mistakesConfused with 'customer' - 'client' is more formal and often involves ongoing services., Use as 'an client' instead of 'a client' - 'client' starts with a consonant sound.Confused with 'client' - generally, 'client' is used in services, 'customer' for retail., Using 'customers' when referring to a singular person., Mispronouncing the word, leading to misunderstanding.
Usage notesUsed in business contexts; suitable for both informal and formal situations. Avoid using in casual conversations unrelated to business.Use 'customer' in business contexts. It's suitable for both formal and casual situations. Avoid using it in very informal conversations where 'client' might be more appropriate.

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Client
Customer

Frequently asked questions: Client vs Customer

What's the difference between Client and Customer?

Client: A person or company that buys services. Customer: A person who buys goods or services.

Which is more common: Client and Customer?

Customer is the most common in everyday English.

Which is more advanced: Client and Customer?

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

Are Client and Customer the same CEFR level?

Client: B1, Customer: A1 on the CEFR scale.

What part of speech are Client and Customer?

Client: noun, Customer: noun.

Can you show an example of each?

Client: The consultant presented her ideas to the client. Customer: The customer returned the item because it was defective.

Can I use Client and Customer interchangeably?

Not always. Client and Customer 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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