The term 'Type of Sea Duck' can be answered by two crossword solutions: SCOTER (6 letters) and EIDER (5 letters). A SCOTER is a large sea duck that is found in the Northern Hemisphere. It has a black head and neck, and its body is usually brown or gray. An EIDER is a large sea duck that is found in the Northern Hemisphere and is known for its thick, downy feathers. It has a black head and neck, and its body is usually white or gray.