There are different kinds of writers. Newswriters write for newspapers or news broadcasts. Columnists write about people, places, and things. Editorial writers write how they feel about something. Technical writers take hard subjects and make them easy to read.
Copy writers write ads.
Editors write, too. They also review, rewrite, and change the words of writers. But their most important job is to plan what should be in a book, a magazine, or a newspaper. They decide what readers will like. They assign topics to writers.