diffuse vs pervade

diffuse

verb
  • To be spread over or through as in air, water, or other matter, especially by fluid motion or passive means. 

  • To spread over or through as in air, water, or other matter, especially by fluid motion or passive means. 

adj
  • Wordy; verbose. 

  • Everywhere or throughout everything; not focused or concentrated. 

pervade

verb
  • To be in every part of; to spread through. 

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