I’m so glad I’m not going insane. I don’t see any examples on that site that I agree are ‘one word’. Sure they’re singular concepts but so what? Are we going to have singular words to describe all adjective noun pairs now?
Of course is like an abbreviation of something like ‘in the natural course of things’. Which has become more like just ‘yes’ over time. In the usage of ‘yes’ it’s easier to argue it could be one word.