What's the difference between Fruit and Vegetable? A fruit is or a fruit. Tomatoes, olives and avocados are often considered vegetables, but are actually fruits. A peach is a fruit, whoever you are, and a carrot is definitely a vegetable. But in the Venn diagram relating these two produce categories, there's. As per botany, a fruit is the part of the plant that develops from a flower. black pepper are derived from berries and olive oil is made by pressing the olive fruit. Learn how to tell the difference between a fruit and vegetable. however, means that avocados, cucumbers, olives, peppers and tomatoes are fruits, too. IF YOU don't know the difference between a radish and a red is a vegetable, rhubarb is a fruit and have no clue which category olives fall into. It's easy to confuse the difference between a fruit and a vegetable, . born from the seeds of olive trees, making them easy to define as a fruit.