Sardina is a commonly used term for a type of small, oily fish. However, there are various synonyms used in different regions and languages across the world. In Spanish, sardina is referred to as "sardina", while in Italian it's called "sardina" as well. In French, the word for sardina is "sardine" and in Portuguese it's "sardinha". English also has a few synonyms for sardina, including "pilchard" and "herring". These fish are often used in many dishes, including tacos, pastas, casseroles and more, and although they may have different names, they are all part of the same family of oily fish known for their rich taste and nutritional benefits.