Type of Seaweed is a broad term that encompasses many different species of aquatic plants. ALGAE (5 letters) is a general term for a large group of aquatic organisms, including seaweeds, which are typically found in shallow waters and can range from single-celled organisms to complex multicellular forms. SARGASSO (8 letters) is a type of seaweed that is found in the SARGASSO Sea, an area of the Atlantic Ocean bounded by four currents. It is characterized by its golden-brown color and is used in many culinary dishes.