Silvervine, also known as Actinidia polygama, is a plant that belongs to the Kiwi family. It is popularly used as a cat stimulant due to the presence of actinidine, which triggers euphoric and playful behavior in cats. Some synonyms for Silvervine include matatabi, cat powder, and Japanese catnip. Matatabi is a Japanese term used for this plant, which has been used in Japan for centuries as an alternative to catnip. Cat powder is another name commonly used for silvervine, as it is often sold in powdered form for ease of use. Lastly, some refer to it as Japanese catnip, as it has similar effects to traditional catnip but is much more potent.