A JOB is a 3-letter word for a paid position, a TASK is a 4-letter word for a piece of work assigned to someone, an ERG is a 3-letter word for a unit of energy or work, an opus is a 4-letter word for a creative work, a STINT is a 5-letter word for a period of work, and a headcase is an 8-letter word for a person who is difficult to deal with. Together, these words can be used to describe a piece of work, which is a JOB, TASK, ERG, opus, STINT, or headcase.