OKer
n.— «There are, of course, many different kinds of editor—from fact-checkers and OKers (as they’re known at the New Yorker), to line-editors and copy editors, to editors who grasp the big picture but skip the detail.» —“Black day for the blue pencil” by Blake Morrison Observer (U.K.) Aug. 6, 2005. (source: Double-Tongued Dictionary)