P is for Pandemonium
These days, a word that is used to mean wild uproar, disorder or chaos. Its original meaning is pretty clear: pan means all and demon means, well, demon. So pandemonium means all demons or, specifically, the place of all demons.
Milton coined the word in Paradise Lost, where he used it to refer to the capital city of Hell itself. Pendemonium was designed by the architect Mulciber and built by the demons in only an hour.
Archaeopteryx Blunderbuss Chthonic Dreadnought Entropy Fulgurite Gargantua Humbucking Ichthyic Juggernaut Kappa Labyrinthine Megrim Numinous Ophidian Pandemonium