coerce vs threaten

coerce

verb
  • To use force, threat, fraud, or intimidation in an attempt to compel one to act against their will. 

  • To restrain by force, especially by law or authority; to repress; to curb. 

  • To force an attribute, normally of a data type, to take on the attribute of another data type. 

threaten

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

  • 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 menace, or be dangerous. 

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

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