SQL> create synonym pkg_synonym for pkg_view_employee;

Synonym created.

SQL>

SQL> CREATE OR REPLACE PACKAGE pkg_employee
  2  IS
  3    FUNCTION fun_emp_sal (p_empno IN EMP.empno%TYPE)
  4    RETURN EMP.sal%TYPE;
  5  END;
  6  /

Package created.

SQL> CREATE OR REPLACE PACKAGE BODY pkg_employee
  2  IS
  3    FUNCTION fun_emp_sal (p_empno IN EMP.empno%TYPE)
  4    RETURN EMP.sal%TYPE
  5    IS
  6       retval EMP.sal%TYPE;
  7    BEGIN
  8       SELECT sal INTO retval FROM EMP
  9      WHERE empno = p_empno;
 10      RETURN (retval);
 11    END;
 12
 13  END;
 14  /

Package body created.

SQL> SELECT pkg_employee.fun_emp_sal(7369) FROM dual;

PKG_EMPLOYEE.FUN_EMP_SAL(7369)
------------------------------
                           800

SQL> CREATE SYNONYM syn_pkg_employee FOR pkg_employee;

Synonym created.

SQL> SELECT syn_pkg_employee.fun_emp_sal(7369) FROM dual;

SYN_PKG_EMPLOYEE.FUN_EMP_SAL(7369)
----------------------------------
                               800

SQL>