absent without leave vs truant

absent without leave

adj
  • In the armed forces, being absent from one's post without prior authorization. 

truant

adj
  • Absent without permission, especially from school. 

  • Wandering from business or duty; straying; loitering; idle, and shirking duty. 

noun
  • One who is absent without permission, especially from school. 

verb
  • To play truant. 

  • To idle away; to waste. 

  • To idle away time. 

How often have the words absent without leave and truant occurred in a corpus of books? (source: Google Ngram Viewer )