I'm a non-native speaker and I'd like to know if it has been grammatically acceptable in the UK or the US to write "best friend" as "bestfriend". I've seen such spelling used a lot on the Internet.

Has "bestfriend" been considered one word instead of two (best friend)? Or is it still incorrect to spell like so?

  • 1
    Whether the usage is "Acceptable" depends on the context. My guess is that this is a back-formation on "bestie" or "BFF" so perhaps in certain contexts (chats, texts) this might be acceptable. I (US Speaker) would not write them as one word in any context, growing up in black and white.
    – rajah9
    Jul 1, 2020 at 12:47
  • When enough people are wrong, they are right - at the moment, there are not enough people being wrong. "Best friend" is two words.
    – Greybeard
    Jul 1, 2020 at 18:08
  • Why do you want to abuse someone else’s language?
    – David
    Jul 31, 2020 at 19:36

1 Answer 1


The words best and friend combine to form a compound word, that is best friend. 'Best' is an adjective and 'friend' is a noun. So best friend is an example of an adjective/noun compound word. Bestfriend, although accepted widely is somewhere awkward. 'Best friend' should be used. Both Oxford dictionary and Merriam Webster dictionary include the word 'best friend'. It is an example of open compound word.

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