columnist(n = noun.person) editorialist - a journalist who writes editorials;
is a kind of journalist
has particulars: newspaper columnist
Derived form noun column₅

   a journalist who writes or edits a regularly scheduled column{8} in a periodical, usually in editorial style; a type of editorialist. [RP]

columnist, n. a journalist contributing regularly to a newspaper.

fifth columnist, gossip columnist, newspaper columnist