constable vs officer

constable

noun
  • A police officer or an officer with equivalent powers. 

  • An elected or appointed public officer, usually at municipal level, responsible for maintaining order or serving writs and court orders. 

  • One holding the lowest rank in most Commonwealth police forces. (See also chief constable.) 

  • The warden of a castle. 

  • An officer of a noble court in the Middle Ages, usually a senior army commander. (See also marshal). 

  • An elected head of a parish (also known as a connétable) 

  • A large butterfly, Dichorragia nesimachus, family Nymphalidae, of Asia. 

officer

noun
  • A respectful term of address for an officer, especially a police officer. 

  • One who has a position of authority in a hierarchical organization, especially in military, police or government organizations. 

  • One who holds a public office. 

  • An agent or servant imparted with the ability, to some degree, to act on initiative. 

  • A commissioned officer. 

verb
  • To supply with officers. 

  • To command as or like an officer. 

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