borrador
/boraˈdoɾ/ · B2 · noun · m
eraser
🧽 borrador = borrar (to erase) + -dor (one that does it): the eraser
Borrar means to erase or rub out, and the suffix -dor marks a tool or agent that performs the action, like English -er. So borrador is the thing that erases. A draft is also called borrador because it is a version still open to being rubbed out and rewritten.