Although these guidelines are not set in stone, they should be sufficient to distinguish between fruits and vegetables most of the time. Fruits and vegetables are classified from both a botanical and culinary standpoint. This article takes a close look at the differences between the two. referred to as vegetables, including tomatoes, avocados and cucumbers. Is the avocado a fruit or a vegetable? Because it belongs in the genus Persea in the Lauraceae family, horticulturally it is meets all of the criteria.