Yes, smooth is a Scrabble word!

Verb

1. Make smooth or smoother, as if by rubbing

2. Make (a surface) shine

3. Free from obstructions

Adjective

1. Having a surface free from roughness or bumps or ridges or irregularities

2. Smoothly agreeable and courteous with a degree of sophistication

3. Of the margin of a leaf shape; not broken up into teeth

4. Smooth and unconstrained in movement

5. (music) without breaks between notes; smooth and connected

6. Of motion that runs or flows or proceeds without jolts or turbulence

7. Lacking obstructions or difficulties

8. (of a body of water) free from disturbance by heavy waves

Noun

1. The act of smoothing