Slat
It is 7/w.
board
board or boards
More information is needed. The plank has a length, width and height and you only gave 2 dimensions. Also we would need something like the density of the plank.
Slat
A plank
The plank was of wood, a few inches wide
A plank.
Board.
board
brown wood
Example sentence - Salmon cooked on a wood plank tastes very good.
It is 7/w.
board
board
board