apropos vs right-hand

apropos

adj
  • Of an appropriate or pertinent nature. 

  • by the way, incidental 

prep
  • Regarding or concerning. 

adv
  • To the purpose; appropriately. 

  • By the way. 

  • Timely; at a good time. 

right-hand

adj
  • of, relating to, or located on the right 

  • in the direction or orientation to the right-hand rule (a right-hand thread) 

  • designed for use by the right hand 

How often have the words apropos and right-hand occurred in a corpus of books? (source: Google Ngram Viewer )