innocuous vs nontoxic

innocuous

adj

  • Harmless; producing no ill effect. 

  • Inoffensive; unprovocative; unexceptionable. 

nontoxic

adj

  • Not toxic; not poisonous. 

noun

  • A substance that is not toxic. 

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