Something is fake if it is not real or genuine. Some fakes are a copy or imitation of the original, like a forgery of a painting or counterfeit money. Many fake things pretend to be real, like mock or fake fur made from polyester instead of real fur made from animal skins. Sometimes you cannot tell the difference between something real and something fake without examining it closely, such as a gold-plated ring and a solid gold ring.
The flowers in the picture are fake.
Most fakes and imitations are considered to be much less valuable than the real thing.
Something is falling if it is moving from a higher place to a lower one. Many things can fall, for example during hot weather the water level of a lake can fall. Prices of fruit for sale can fall. When you drop something, it falls.
The stunt man in the picture is falling off a building.
Fall is also another name for autumn.