May I put the "sign of equality" between "someone" and "somebody"?
May the word "someone" subtitute for the word "somebody" in some sentences? The same we may use with "anyone" and "anybody". Thank you in advance!

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As above, however sometimes 'somebody' is understood as someone of great importance somewhere,in this case you can't interchange it with 'someone ' as in :
" He is somebody in this town."

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'Someone' and 'somebody' mean the same thing as do 'anyone' and 'anbody', so you can use either in both cases.

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Are you asking if "someone" and "somebody" are the same word?

They are the same word!