excrescence vs toxicant

excrescence

noun
  • A disfiguring or unwanted mark or adjunct. 

  • The epenthesis of a consonant, e.g., warmth as [ˈwɔrmpθ] (adding a [p] between [m] and [θ]), or -t (Etymology 2). 

  • Something, usually abnormal, which grows out of something else. 

toxicant

noun
  • A toxic or poisonous substance. 

adj
  • Capable of causing damage or dysfunction by toxicity; (broadly) poisonous. 

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