In modern English, most people use "vegetable" with its current culinary meaning.

In earlier centuries, "vegetable" still had mostly its original meaning taken from Latin, where "Vegetabilia", as used e.g. by Linnaeus for the "vegetabile regnum", referred to any living beings capable of growth, but incapable of motion, i.e. mainly to the terrestrial plants.

Strictly speaking, seeds, grains, nuts, fruits, roots, bulbs, leaves, stems, etc. are all parts of vegetables.

What in English is now called "vegetables" corresponds to the Latin word "holera", whose original meaning was "greens", and not at all with the Latin word "vegetabilia". Also English "fruits" does not correspond with Latin "fructa", but with Latin "poma". Latin "fructa" referred to the useful results of some activity, a sense still encountered more rarely in English.