Okay, so let's comapare.
From dictionary.com:
Vegetable: A plant cultivated for an edible part, such as the root of the beet, the leaf of spinach, or the flower buds of broccoli or cauliflower.
The edible part of such a plant.
A member of the vegetable kingdom; a plant.
Offensive Slang. One who is severely impaired mentally and physically, as by brain injury or disease.
One who is regarded as dull, passive, or unresponsive.
Fruit: The ripened ovary or ovaries of a seed-bearing plant, together with accessory parts, containing the seeds and occurring in a wide variety of forms.
An edible, usually sweet and fleshy form of such a structure.
A part or an amount of such a plant product, served as food: fruit for dessert.
The fertile, often spore-bearing structure of a plant that does not bear seeds.
A plant crop or product: the fruits of the earth.
Result; outcome: the fruit of their labor.
Offspring; progeny.
A fruity aroma or flavor in a wine.
Offensive Slang. Used as a disparaging term for a homosexual man.