board
Wood, timber, tree .... plank
board
board
That would depend on the thickness of the plank. It would also vary, depending on the type of wood, and where you buy it (what country, for instance).
They made us do the exercise plank today.
A bench across a boat is called a plank. The word "plank" means: A long, thin, flat piece of timber, used esp. in building and flooring. There are many other names for a bench across a boat including board. But the main one I have found is the word "plank".
board
The Spanish word "tablon" translates to "plank" or "board" in English.
Example sentence - Salmon cooked on a wood plank tastes very good.
Plank
Board.
A wooden plank is homophonous with a "board" when referring to a flat, rectangular piece of wood.
panel, plank, timber
from the Latin word - Tabula. It means a board or a plank.
Wood, timber, tree .... plank
board