Pa vs geriatric

Pa

noun

  • A short form of grandpa; grandfather. 

  • Father, dad, papa. 

geriatric

noun

  • An old person. 

adj

  • Relating to geriatrics. 

  • Relating to the elderly. 

  • Elderly, old. 

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