nah vs nay

nah

intj
  • here! (when giving something). 

  • No. 

nay

noun
  • A vote against. 

  • A person who voted against. 

adv
  • Or rather, or should I say; moreover (introducing a stronger and more appropriate expression than the preceding one). 

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