appreciably vs certifiably

appreciably

adv
  • In an appreciable manner; to a large extent; considerably. 

certifiably

adv
  • To a great extent. 

  • With the potential for certification. 

  • Undoubtedly, demonstrably. 

  • Genuinely 

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