Yes, spiral is a Scrabble word!

Verb

1. To wind or move in a spiral course

2. Form a spiral

3. Move in a spiral or zigzag course

Adjective

1. In the shape of a coil

Noun

1. A plane curve traced by a point circling about the center but at increasing distances from the center

2. A curve that lies on the surface of a cylinder or cone and cuts the element at a constant angle

3. A continuously accelerating change in the economy

4. Ornament consisting of a curve on a plane that winds around a center with an increasing distance from the center

5. A structure consisting of something wound in a continuous series of loops

6. Flying downward in a helical path with a large radius