hooky vs truancy

hooky

noun
  • Absence from school or work; truancy. 

adj
  • Full of hooks (in any sense). 

  • Dodgy; crooked; illicit. 

  • Shaped like or resembling a hook; hooked. 

truancy

noun
  • The act of shirking from responsibilities and duties, especially from attending school. 

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