cos vs though

cos

conj
  • because 

noun
  • A variety of lettuce with long, crisp leaves. 

  • A cousin, cuz. 

though

conj
  • Despite the fact that; although. 

adv
  • Used to intensify statements or questions; indeed. 

  • Despite that; however. 

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