The term 'Shaker Filler' refers to a job that involves filling SALT shakers. This job requires the worker to fill SALT shakers with SALT, ensuring that the shakers are filled to the correct level. The crossword solutions for this term are SALT, which is a four-letter word. SALT is a mineral composed primarily of sodium chloride and is used as a seasoning in many dishes. It is also used to preserve food and can be found in many households.