Romanistic refers to anything connected to the Roman Empire or the Roman Catholic Church. If you're searching for synonyms for this term, you can try words like 'Romanesque,' which denotes a style of art and architecture associated with the Roman Empire. Another possible synonym is 'Rome-like,' although it's not a frequently used term. Other words that might serve as replacements for Romanistic include 'Latin,' 'Catholic,' 'Papal,' 'Imperial,' or 'Roman.' These terms all allude to the same historical period and iconic institutions as Romanistic, but with various connotations and nuances of meaning. So, depending on the context, you may choose any of these synonyms to add variety to your vocabulary.