tautological
🇺🇸
/ˌtɔːtəˈlɑːdʒɪkl/
🇬🇧
/ˌtɔːtəˈlɒdʒɪkl/
Repeating the same idea or fact in different words, which is not needed.
Saying 'free gift' is tautological because all gifts are free.