chilling vs ominous

chilling

adj
  • Causing mild fear. 

  • Becoming cold. 

  • Causing cold. 

noun
  • The act by which something is chilled. 

ominous

adj
  • Specifically, giving indication of a coming ill; being an evil omen 

  • Of or pertaining to an omen or to omens; being or exhibiting an omen; significant. 

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