healful vs salutary

healful

adj
  • Tending or serving to heal; health-promoting; healing. 

  • Full of health or safety; healthy; whole; sound; safe. 

  • Affording health or salvation. 

salutary

adj
  • Promoting good health and physical well-being; wholesome; curative. 

  • Effecting or designed to effect an improvement; remedial: salutary advice. 

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