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Is there any additional difference between everybody and everyone apart from that everybody is less formal than everyone? What about somebody and someone? Thank you in advance.
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Fandorineverybody is less formal than everyone

Some people say so, but I don't perceive it that way.

The "everyone"/"everybody" distinction (if any) is is an old chestnut -- as is "someone"/"somebody", "anyone"/"anybody" and "no one"/"nobody". If you search Google you will find lots of discussion. To me, the words are freely interchangeable as far as I can tell, though it's impossible to bring to mind every circumstance in which I might use them, so there remains a chance that I might have a slight idiomatic preferences in certain situations.
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Students: We have free audio pronunciation exercises.
My dear friend, There is no difference between those words.
Hi Mr. Wordy.
Mr Wordy To me, the words are freely interchangeable
That's what I want to hear. Emotion: smile Thank you a lot.

To Anon. Thank you for an answer.