eraser

One who erases.

(Canada, US) A thing used to erase or remove something written or drawn by a pen or a pencil.

(Canada, US) A thing used to erase something written by chalk on a chalkboard, by marker on a whiteboard, or by some other erasable implement; a chalkboard eraser, whiteboard eraser, etc.

(computing) An overwriter program used to prevent data recovery.