There's a huge drawback to reading a lot of fantasy.
First off. Try playing Words with Friends with some of the words In G.R.R. Martin's books. It breaks the game.
Secondly, you get used to reading 'fake' words and just rolling with it. Ascertaining the meaning by either the author telling you outright, or by clues in the text.
The drawback here is that when you come across a REAL word that you mistake as being fake and you make up a definition for it...you have nothing that will tell you that this is wrong.
One of the biggest Real Word Masquerading As Fake that I can remember is the word Penultimate.
I know. Pretty standard, right? Except that in most of the fantasy books I read it was followed by some noun, or something pretty major and game changing.
"This was Thor's penultimate challenge before he was kicked out of Olympus for good!"
WHAT? Whoa! That's pretty heavy! And then some crazy challenge would happen... chaos would ensue. Stuff and crazyness...and Thor gets some woman pregnant (isn't that the story? or am I confusing my gods here?) And gets kicked off Olympus.
And then again in some choose your own adventure books...there was always a Penultimate Choice. Which at this point in the story, again, no matter which way you chose...Chaos and anarchy! Terror, terror, terror death and hell. Then... The End.
So in my brain this word came to mean Very Important.
Which is close. Sort of. But not really. And for most of my life, (right up until I saw it on my SAT's, and I almost said "What the Fuck?" out loud...) I really thought it was a made up fantasy word.
Have you ever made up a definition for a word and not realized your mistake until much later on in life?
Preferably not when you're taking a placement exam for college...