Is “Setback” a Scrabble word?

1.An obstacle, delay, disadvantage, blow (an adverse event which retards or prevents progress towards a desired outcome)

“After some initial setbacks, the expedition went safely on its way.”

2.The required distance between a structure and a road.

3.A step-like recession in a wall.

“Setbacks were initially used for structural reasons, but now are often mandated by land use codes.”