The term 'process of rubbing out' can be summarized as 'ERASURE, ' which is a seven-letter word. ERASURE is the act of removing or deleting something, usually by rubbing or scrubbing it away. It is commonly used to remove pencil or pen marks from paper, but can also refer to the deletion of digital data. ERASURE is often used in the context of editing documents or artwork, as well as in the context of data security and privacy.