How to Find all table of a schema which doesnot have synonyms.

Dear all,

I want to list all the tables of a schema doenot  have synonyms.

i uesd the below script but it list all the tables

select count(*) from dba_tables t  left outer join synonyms s
on  t.owner = s.creator
and t.table_name = s.tname
and  s.creator ='schema'
where t.owner ='schema'
and s.creator is null