mossback vs old-timer

mossback

noun
  • Synonym of mossyback (“a person with old-fashioned views; hence, one who is very conservative or reactionary”) 

  • The largemouth bass or moss bass (Micropterus salmoides). 

  • Synonym of mossyback (“a fish that is large and old, especially one that has algae growing on its back”) 

  • A person who stayed hidden to evade conscription (especially by the Confederate States Army) during the American Civil War (1861–1865); a mossyback. 

  • A turtle that, because of its age, has a growth of algae on its back 

  • The common snapping turtle (Chelydra serpentina). 

old-timer

noun
  • One who has been around for a long time or has a great deal of experience; a veteran. 

How often have the words mossback and old-timer occurred in a corpus of books? (source: Google Ngram Viewer )