anxiolytic vs benzodiazepine

anxiolytic

noun
  • A drug prescribed for the treatment of symptoms of anxiety. 

adj
  • That reduces anxiety; tranquilizing 

benzodiazepine

noun
  • Any of a class of psychoactive drugs, structured upon diazepine, used in the treatment of anxiety, insomnia and other related disorders. 

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