dormancy vs inertness

dormancy

noun
  • The state or characteristic of being dormant; quiet, inactive restfulness. 

inertness

noun
  • Lack of activity or exertion; habitual indisposition to action or motion 

  • Absence of the power of self-motion; inertia. 

  • Quality of being unreactive with other chemical compounds or elements. 

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