Some vegetable leaves that are eaten are lettuce, spinach, and kale.
greens
Vegetable
An artichoke.
vegetable oil
potato's and other such vegetables
to steam vegetable and other stuff like other vegetables.
vegetable oil and a load of other stuff
No more than any other vegetable.
its a fruit because it has seeds
Olive oil is a vegetable oil. You can often substitute other vegetable oils, but only experience, or a knowledgeable person can tell you it that will work for a particular recipe.
An edible plant is a vegetable.