I think they serve two different purposes. “World news” is literally event by event news, “world” can be more discussion-oriented (edit: well, except that they… only allow news articles, geez).
I just posted an op-ed in /c/worldnews a minute ago thinking “huh this would fit better if there were a /c/world, this isn’t exactly news so much as analysis” (then just now seeing this post). If we learned one thing from reddit it’s not to centralize control over communities.
jimmydoreisalefty