Did you try Google? "Nuts are seeds of certain trees. Botanically, nuts are classified as fruits, because they develop from pollinated flowers" http://www.fruitarian.com/ag/Varieties_of_fruits.htm
yeah, also legumes are fruits of sorts; famiglia delle pappilonacee; :ù fagiolo, ù fava, ù pisello, ù ciece, ù lenticchia, ù soia, schtanno tutti legumi.