impressment vs kidnap

impressment

noun
  • The act of seizing for public use; impressing into public service. 

kidnap

noun
  • The crime, or an instance, of kidnapping. 

verb
  • To seize or detain a person unlawfully and move or conceal them; sometimes for ransom. 

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