There’s a list of which words are real and which are fake on the wiki at http://www.explainxkcd.com/wiki/index.php/1572:_xkcd_Survey#Difficult_words http://www.

There’s a list of which words are real and which are fake on the wiki at http://www.explainxkcd.com/wiki/index.php/1572:_xkcd_Survey#Difficult_words http://www.explainxkcd.com/wiki/index.php/1572:_xkcd_Survey#.... The fake words aren’t even in the Oxford English Dictionary – I checked.