How can we differenciate a Justice with a Judge and a Magistrate?

Answer 1

Judge or justice is an official who presides over a court. The powers, functions, method of appointment, discipline, and training of judges vary widely across different jurisdictions.

Magistrate is a judicial officer. In common law systems a magistrate usually has limited authority to administer and enforce the law. In civil law systems a magistrate may be a judge of a superior court. In some jurisdictions, such as Australia, the term has become both Federal Magistrates and state magistrates have jurisdiction similar to a judge. A magistrate's court may have jurisdiction in civil cases, criminal cases, or both. A related, but not always equivalent, term is Chief Magistrate, which (historically) can refer to political and administrative as well as judicial officers.