orcl> select object_id,data_object_id from user_objects where object_name='EMP';

 OBJECT_ID DATA_OBJECT_ID
---------- --------------
     81149          81149

orcl> alter table emp move;

Table altered.

orcl> select object_id,data_object_id from user_objects where object_name='EMP';

 OBJECT_ID DATA_OBJECT_ID
---------- --------------
     81149          81775

orcl>

SQL> create public synonym dept_syn for dept;

Synonym created.

SQL> select * from dept_syn;

    DEPTNO DNAME          LOC
---------- -------------- -------------
        10 ACCOUNTING     NEW YORK
        20 RESEARCH       DALLAS
        30 SALES          CHICAGO
        40 OPERATIONS     BOSTON
        50 Myname         luk
        60 DSD            SDSD

6 rows selected.

SQL> drop table dept_syn;
drop table dept_syn
           *
ERROR at line 1:
ORA-00942: table or view does not exist