though vs whereas

though

conj
  • Despite the fact that; although. 

adv
  • Used to intensify statements or questions; indeed. 

  • Despite that; however. 

whereas

conj
  • In contrast; whilst on the contrary; although. 

  • It being the fact that; inasmuch as. (Often used to begin recitals; sometimes emboldened or emphasized as a signifier.) 

noun
  • A clause, as in legal documents, stating whereas. 

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