if'n vs notwithstanding

if'n

conj

  • If. 

notwithstanding

conj

  • Although; despite; even though. 

prep

  • In spite of, despite. 

postp

  • In spite of, despite. 

adv

  • Nevertheless, all the same. 

How often have the words if'n and notwithstanding occurred in a corpus of books? (source: Google Ngram Viewer )