That doesn't mean they're both words. I'm very confident pedanticism is not a word. I'll look it up in my mum's crossword dictionary if I can ever be bothered.
Well, English is an ever evolving language and anything widely used is soon included.
JK Rowling introduced the word 'stumped' into dictionaries I believe.
Powdered root of what to an infusion of what? Harry glanced at Ron, who looked as stumped as he was.
Its really fascinating to argue with fellow pedants.