The job of clearing a blackboard requires the use of the word 'ERASE, ' which is a five-letter word. Erasing a blackboard involves wiping away any markings or writing that has been written on it, usually with a cloth or eraser. This is often done in classrooms to prepare for a new lesson or activity. It is also done in other settings, such as offices or meeting rooms, to clear the board for a new presentation or discussion.