This article explains why avocado is technically a fruit. Both fruits and vegetables come from plants, and it can be hard to distinguish between. Some say it's a fruit, while others say it's a vegetable. What about you? See More. Tropical fruit trees, akee, all spice, ambarella, annona, avocado, cherry. In an avocado or olive, the seed is the stone at the centre. Remember that This Mediterranean favourite is the fruit of the olive tree. 5. Other.