emeritus vs swaybacked

emeritus

adj
  • Retired, but retaining an honorific version of a previous title. 

noun
  • A person retired in this sense. 

swaybacked

adj
  • Old. 

  • Having sagged or hollow surface. 

  • Having a sagged back. 

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