contestation vs wrangling

contestation

noun
  • The act of contesting; emulation 

  • Proof by witness; attestation; testimony. 

wrangling

noun
  • contention; gainstriving 

  • a dispute; a contentious argument; a brawl 

  • dispute; disputation; quarreling 

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