Anything is a word if you’re brave enough. Yerp steeb snop florb

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i mean it is tho. all words are made up to convey a meaning. and people know what you mean when you say funner. sounds correct to me

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Language is made up! Use it? People understand what it means? It’s a word now!

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Use it enough and the evolution of linguistics will solve that for you. And Merriam-Webster.

1

It is, it's the comparative of "fun". From the Oxford dictionary:

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I had no idea that "fun" as an adjective was a new thing

1