Companion vs Friend of mine

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

Companion

Top 2,000 (common)C1noun

Friend of mine

InformalTop 2,000 (common)
Most formal: Companion
 CompanionFriend of mine
Pronunciation🇬🇧 /["/kəmˈpænjən/"]/🇺🇸 /["/kəmˈpænjən/"]/🇬🇧 //frɛnd əv maɪn//🇺🇸 //frɛnd əv maɪn//
MeaningA friend or someone you spend time with.A person I know and like.
ExampleShe brought her trusty companion on the hiking trip to explore the mountains together.I met a friend of mine at the concert last night.
RegisterNeutralInformal
How commonTop 2,000 (common)Top 2,000 (common)
CEFR levelC1-
Part of speechnoun
Collocationsagreeable, boon, charming, animal, companion for, companion to, agreeable, boon, charming, animal, companion for, companion toa close friend of mine, a good friend of mine, an old friend of mine
Antonymsenemy, rival, loner-
Common mistakesUsing 'companion' to refer to a business associate instead of a personal friend., Confusing 'companion' with 'partner' in all contexts., Using 'companions' inappropriately in singular contexts.Using it as 'a friend of mines' rather than the correct form., Confusing it with 'my friend' which is more direct., Omitting the 'of' and saying 'friend mine'.
Usage notesCommonly used for pets, friends, or people who accompany you. Not often used in a formal context. Avoid using it to refer to someone you don't have a close relationship with.Use 'friend of mine' in casual settings. It's more personal than just 'friend'. Avoid in formal contexts.

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Friend of mine

Frequently asked questions: Companion vs Friend of mine

What's the difference between Companion and Friend of mine?

Companion: A friend or someone you spend time with. Friend of mine: A person I know and like.

Which is more formal: Companion and Friend of mine?

Companion is the most formal of these.

Can you show an example of each?

Companion: She brought her trusty companion on the hiking trip to explore the mountains together. Friend of mine: I met a friend of mine at the concert last night.

Can I use Companion and Friend of mine interchangeably?

Not always. Companion and Friend of mine 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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