"bollard" [1] - I always called them steel poles with concrete inside, buried in the ground. Someone here corrected me and I learned something. Adding to that I never associated them with the more artistic versions as I assumed those were weaker or just for looks.
[1] - https://en.wikipedia.org/wiki/Bollard
https://twitter.com/WorldBollard
Haven't seen "yon" yet.
"drunk the kool-aid" is another, though a phrase, not a word.
"cromulent" is another