(~s)
1.
Woodchip is a type of wallpaper which has lots of small lumps on its surface that are formed by tiny pieces of wood glued to the underneath.
N-UNCOUNT
2.
Woodchips are very small pieces of wood, usually made from waste wood, which are used in processes such as making paper.
...the domestic market for ~s.
...the Government’s decision to cut ~ exports by 20%.
N-VAR