Return and back both have the same meaning. Can we use the word ?returned back??

Yes both words have same meaning but these words use according to sentence nature.

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it has the same meaning but it cant be used together.You can say'will return your call'or'will call back'

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yes both are same & either of them can be used,or both at a time, but one minute difference is Return is giving back after utilising for the purpose but back will be used when it is not utilised or when not required