not yet vs though

not yet

adv
  • Not quite; not exactly. 

  • Not for the moment, though expected later. 

noun
  • A skill that one is learning but has not yet acquired. 

though

adv
  • Despite that; however. 

  • Used to intensify statements or questions; indeed. 

conj
  • Despite the fact that; although. 

How often have the words not yet and though occurred in a corpus of books? (source: Google Ngram Viewer )