risk vs threaten

risk

verb
  • To incur risk of (something). 

  • To incur risk as a result of (doing something). 

  • To incur risk of harming or jeopardizing. 

noun
  • A possible adverse event or outcome. 

  • A borrower (such as a mortgage-holder or person with a credit card). 

  • An entity insured by an insurer. 

  • The potential negative effect of an event, determined by multiplying the likelihood of the event occurring with its magnitude should it occur. 

  • The magnitude of possible loss consequent to a decision or event. 

  • The probability of a negative outcome to a decision or event. 

  • A type of adverse event covered under an insurance policy. 

  • A financial product (typically an investment). 

  • A thing (from the perspective of how likely or unlikely it is to cause an adverse effect). 

threaten

verb
  • To menace, or be dangerous. 

  • To portend, or give a warning of. 

  • To call into question the validity of (a belief, idea, or viewpoint); to challenge. 

  • He threatened me with a knife. 

  • To make a threat against someone; to use threats. 

  • To be close to equaling or surpassing (a record, etc.) 

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