improving vs vulnerary

improving

adj
  • That tends to improve someone or something (especially (dated) to educate or morally better a person). 

vulnerary

adj
  • Useful or used for healing wounds; healing, curative. 

noun
  • A healing drug or other agent used in healing and treating wounds. 

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