If the synonym name is found within the User Interface Default Attribute Dictionary, the synonym name is deleted.
APEX_UI_DEFAULT_UPDATE.DEL_AD_SYNONYM ( p_syn_name IN VARCHAR2);
Table 34-4 DEL_AD_SYNONYM Parameters
Name of synonym to be deleted
The following example deletes the synonym CREATED_BY_USER from the UI Defaults Attribute Dictionary within the workspace associated with the current schema.
BEGIN apex_ui_default_update.del_ad_synonym ( p_syn_name => 'CREATED_BY_USER' ); END;