Well, columnist is just a subcategory of author. A columnist is an author who writes a regular column for a newspaper... like Ann Landers, or that type of thing. Other authors might write novels, or poems, or short stories, or personal essays. They are all authors, but words like "novelist," "poet," or "essayist" would also cover some of the subcategories.
Author, Columnist, WAG
Ann Coulter is a/an Author, columnist, political commentator
Tucker Carlson is a/an Television journalist, commentator,columnist,author
Nothing, the difference is in the author's style of writing
Billy O'Reilly is T.V host, Author, Sydicated columnist, Political Commentator.
The cast of Union libre - 1998 includes: Nikos Aliagas as Greek columnist (1998-2001) Christine Bravo as Herself - Host Anette Burgdorf as German columnist Ilario Calvo as Italian columnist Heikki Cantell as Finnish columnist Ray Cokes as English columnist (2000-) Dominique Dislaire as Belgian columnist Martineke Kooistra as Deutsch columnist Olia Lydaki as Greek columnist (2001-) Louisa MacMahon as Irish columnist Luis Martinez as Spanish columnist (2001-) Erik Svensson as Swedish columnist
Heloise - columnist - was born in 1951.
René Carayol is a broadcaster, broadsheet columnist, business and leadership speaker and author
A columnist is a person that write short stories about everydsy life
Singer performs; author writes the lyrics and/or the sheet music.
Nick Coleman - columnist - was born in 1950.
Jim Hunt - columnist - was born in 1926.