a piece of wood is a kind of object
stake_made_of_wood is woodwork. piece_of_wooden_furniture is woodwork. artifact_made_of_wood is woodwork. wood is material. wood is not solid_object. piece_of_wooden_furniture is furniture. wood is solid_object. another_type_of_material is wood. piece_of_wooden_furniture is not woodwork. stake_made_of_wood is not woodwork.