concrete vs perception

concrete

verb
  • To solidify: to change from being abstract to being concrete (actual, real). 

  • To cover with or encase in concrete (building material). 

adj
  • Made of concrete, a building material. 

  • Being or applying to actual things, not abstract qualities or categories. 

  • Real, actual, tangible. 

  • Particular, specific, rather than general. 

  • United by coalescence of separate particles, or liquid, into one mass or solid. 

noun
  • An extract of herbal materials that has a semi-solid consistency, especially when such materials are partly aromatic. 

  • Specifically, a building material created by mixing cement, water, and aggregate such as gravel and sand. 

  • Sugar boiled down from cane juice to a solid mass. 

  • A dessert of frozen custard with various toppings. 

  • A term designating both a quality and the subject in which it exists; a concrete term. 

perception

noun
  • That which is detected by the five senses; not necessarily understood (imagine looking through fog, trying to understand if you see a small dog or a cat); also that which is detected within consciousness as a thought, intuition, deduction, etc. 

  • Vision (ability) 

  • Conscious understanding of something. 

  • The organisation, identification and interpretation of sensory information. 

  • Acuity 

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