sandpaper

timber - trees in a forest regarded as a source of wood. / material wood, (UK) timber, (US) lumber - wood that has been pre-cut and is ready for use in construction.

smooth (surface; progress) / calm (water)

smooth (surface)

needed, necessary

need, necessity

paper

鑢, 鈩: a file (cutting or smoothing tool)

スリ: pickpocket

pickpocket