Wood is a material found on several plants, such as trees.
In the past, the Bajorans often used saber saws to cut it, while by the 24th century, laser torches were often used. (DS9: "Explorers")
Quark had a wooden chewstick when he was young, whereas Rom had a tooth sharpener made out of latinum. (DS9: "Family Business")
The Pike City Pioneers chose wooden baseball bats over those made of polyduranide. (DS9: "Family Business")