insight vs perception

insight

noun
  • Intuitive apprehension of the inner nature of a thing or things; intuition. 

  • Knowledge (usually derived from consumer understanding) that a company applies in order to make a product or brand perform better and be more appealing to customers 

  • A sight or view of the interior of anything; a deep inspection or view; introspection; frequently used with into. 

  • An extended understanding of a subject resulting from identification of relationships and behaviors within a model, context, or scenario. 

  • Power of acute observation and deduction 

  • An individual's awareness of the nature and severity of one's mental illness. 

perception

noun
  • Conscious understanding of something. 

  • 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) 

  • The organisation, identification and interpretation of sensory information. 

  • Acuity 

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