diffuse vs essential

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. 

essential

noun
  • A necessary ingredient. 

  • A fundamental ingredient. 

adj
  • Necessary. 

  • Necessary for survival but not synthesized by the organism, thus needing to be ingested. 

  • Being in the basic form; showing its essence. 

  • Really existing; existent. 

  • Very important; of high importance. 

  • Having the nature of essence; not physical. 

  • Such that each complementary region is irreducible, the boundary of each complementary region is incompressible by disks and monogons in the complementary region, and no leaf is a sphere or a torus bounding a solid torus in the manifold. 

  • Idiopathic. 

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