They are hard-shelled fruits (Fruits vs. Nuts) of plants which are an important (Urgent vs. Important) source of nutrients for man and some animals. Some examples of nuts are hazelnuts, chestnuts, acorns and hickories, and they are characterized by the stony fruit wall which is actually a composite of the seed and the fruit.
Nuts are rich in protein, vitamins, minerals and fat; while seeds are rich in protein, vitamin B, minerals, fat and dietary fibers. Peanuts and ground nuts are not part of the "nuts" family, they are actually legumes.
What are Seeds?
Seeds are the small plant enclosed in the seed coat, which usually has stored food. There are some edible seeds which are a crucial part of the human and animal kingdom diet, because they provide a good source of vitamins, minerals and nutrients.
Some seeds (sesame and poppy seeds)can be eaten without the removal of the outer husk, and other seeds require the husk to be removed.
What are Beans?
Beans are considered seeds, however not all seeds are beans. Beans are commonly characterized as being a legume. Common bean types include: haricot, butter, navy, kidney and red beans.
There are many different subtypes of beans such as, The vicia (faba), pisum (pea), lens (lentils), lablab (hyacinth), glycine (soybeans), and erythrina (coral bean) are among the most popular.
Other plants which are not closely linked to the same legume family are still classified as beans like the castor, coffee, vanilla and cocoa bean. Simply because of appearance.