though vs too

though

adv
  • Despite that; however. 

  • Used to intensify statements or questions; indeed. 

conj
  • Despite the fact that; although. 

too

adv
  • Likewise. 

  • Used to contradict a negative assertion. 

  • To an excessive degree; over; more than enough. 

  • Also; in addition. 

  • To a high degree, very. 

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