The term 'Trough Filler' refers to a job that involves filling animal feeders with food. This job is often done by farmers and ranchers, who use the feeders to provide food for their livestock. The two crossword solutions for this term are 'FEED' (4 letters) and 'SLOP' (4 letters). FEED is a general term for food given to animals, while SLOP is a type of FEED that is made up of wet or semi-solid mixtures of grains, proteins, and other ingredients.