conn vs recommendation

conn

noun
  • The duty of directing a ship, usually used with the verb to have or to take and accompanied by the article "the." 

verb
  • To direct a ship; to superintend the steering of (a vessel); to watch the course of (a vessel) and direct the helmsman how to steer (especially through a channel, etc, rather than steer a compass direction). 

recommendation

noun
  • A suggestion or proposal about the best course of action (with adpositions including "about" for the context and "to" for the course of action) 

  • An act of recommending. 

  • That which is recommended. 

  • A commendation or endorsement. 

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