though vs until

though

conj
  • Despite the fact that; although. 

adv
  • Used to intensify statements or questions; indeed. 

  • Despite that; however. 

until

conj
  • Up to the time that (a condition becomes true). 

  • Before (a condition becoming true). 

prep
  • Up to the time of (something happening). 

  • Up to (a certain place) 

  • Before (a time). 

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