adjutant vs warrant officer

adjutant

noun
  • A lower-ranking officer who assists a higher-ranking officer with administrative affairs. 

  • Any bird of the genus Leptoptilos, a branch of the stork family (Ciconiidae) native to India and Southeast Asia. 

  • An assistant. 

adj
  • Assistant; who helps a higher-ranking officer. 

warrant officer

noun
  • An officer holding rank by virtue of a warrant rather than a commission. 

  • An officer assigned to execute warrants and other writs. 

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