What is the difference between a teapot and a tea-kettle?
A teapot is used for the brewing and serving of tea. It is a covered vessel in a variety of shapes with a spout and, on the opposite side of the pot, a handle. The spout is usually attached near the bottom so as to drain the tea without disturbing the floating tea leaves.
A tea-kettle is a kind of kettle—a large, flat-bottomed and covered vessel with an overhead handle and a spout—for hot water, used to replenish the teapot when brewing tea. This tea-kettle rests on a stand, which contains a device for heating and keeping the water hot.