Highfalutin, on the other hand, does seem more commonly used in every-week-or-so language, yet I certainly had no clue how to spell it until I just checked. The more commonly used "highbrow" is probably in daily use.
I love words, language, grammar, and punctuation (the last being my weakness). One of my favorite books is Eats Shoots and Leaves on how punctuation use and misuse can really alter the meaning and intent of a written sentence, often to humorous (to a nerd) effect.
Eats Shoots and Leaves has been adapted to a younger audience, intended for those in grades 1 to 3. Here, "Eat here, and get gas," or "Eat here and get gas" really illustrates the critical importance of proper comma use!A panda walks into a café. He orders a sandwich, eats it, then draws a gun and proceeds to fire it at the other patrons. 'Why?' asks the confused, surviving waiter amidst the carnage, as the panda makes towards the exit. The panda produces a badly punctuated wildlife manual and tosses it over his shoulder. 'Well, I'm a panda,' he says, at the door. 'Look it up.' The waiter turns to the relevant entry in the manual and, sure enough, finds an explanation. 'Panda. Large black-and-white bear-like mammal, native to China. Eats, shoots and leaves.'