sentences: a piece of wood is a kind of object
docs: wood is solid_object. artifact_made_of_wood is woodwork. stake_made_of_wood is woodwork. wood is material. lumber is woodwork. another_type_of_material is wood. board is piece_of_wood. piece_of_wooden_furniture is furniture. piece_of_wooden_furniture is wooden_part. piece_of_wooden_furniture is woodwork.