“Trutherism” is not a real word.
What makes a word “real”, pray tell? Is it “fake” until Webster’s gets around to recognizing it?
Are you telling me you don't know the difference between a word that someone makes up to suit his own purpose and a word that has common accepted usage and is recognized in the dictionary?
I would recommend you take a remedial English class before you write things to send to others.
Maybe you need several remedial English classes.
Most people learn the difference between real words and made up words around 2nd grade if not earlier.