To delete a complete word from the left or right of the cursor:


Hold down the CTRL (Windows) or Command (Mac) key and press Backspace. It will delete the complete word from the left of the cursor.


Hold down the CTRL (Windows) or Command (Mac) key and press Delete. It will delete the complete word from the right of the cursor.


Alternate keys for Mac which also can be used for the same:

                   Option + Delete to delete words to the left


                    Function + Option-Delete to delete words to the right