SQL> desc user_synonyms
 Name					   Null?    Type
 ----------------------------------------- -------- ----------------------------
 SYNONYM_NAME				   NOT NULL VARCHAR2(30)
 TABLE_OWNER					    VARCHAR2(30)
 TABLE_NAME				   NOT NULL VARCHAR2(30)
 DB_LINK					    VARCHAR2(128)

SQL> select synonym_name from user_synonyms where rownum = 1;

SYNONYM_NAME
------------------------------
DEF$_AQCALL

SQL> select dbms_metadata.get_ddl('SYNONYM','DEF$_AQCALL') FROM DUAL;

DBMS_METADATA.GET_DDL('SYNONYM','DEF$_AQCALL')
--------------------------------------------------------------------------------

  CREATE OR REPLACE SYNONYM "SYS"."DEF$_AQCALL" FOR "SYSTEM"."DEF$_AQCALL"