uncover vs unstop

uncover

verb
  • To remove a cover from. 

  • To remove one's hat or cap as a mark of respect. 

  • To reveal the identity of. 

  • To expose the genitalia. 

  • To show openly; to disclose; to reveal. 

  • To expose (lines of formation of troops) successively by the wheeling to right or left of the lines in front. 

unstop

verb
  • To unplug or uncork a container. 

  • To draw out the stops of (an organ). 

  • To remove a stoppage; to clear a blockage. 

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