abnormal vs preternatural

abnormal

adj
  • Not conforming to rule or system; deviating from the usual or normal type. 

  • Of or pertaining to that which is irregular, in particular, behaviour that deviates from norms of social propriety or accepted standards of mental health. 

noun
  • A person or object that is not normal. 

preternatural

adj
  • Beyond or not conforming to what is natural or according to the regular course of things; strange. 

How often have the words abnormal and preternatural occurred in a corpus of books? (source: Google Ngram Viewer )