comparison vs correlation

comparison

noun
  • That to which, or with which, a thing is compared, as being equal or like; illustration; similitude. 

  • The faculty of the reflective group which is supposed to perceive resemblances and contrasts. 

  • An evaluation of the similarities and differences of one or more things relative to some other or each other. 

  • The act of comparing or the state or process of being compared. 

  • A simile. 

  • With a negation, the state of being similar or alike. 

  • A feature in the morphology or syntax of some languages whereby adjectives and adverbs are inflected to indicate the relative degree of the property they define exhibited by the word or phrase they modify or describe. 

correlation

noun
  • A reciprocal, parallel or complementary relationship between two or more comparable objects. 

  • An isomorphism from a projective space to the dual of a projective space, often to the dual of itself. 

  • One of the several measures of the linear statistical relationship between two random variables, indicating both the strength and direction of the relationship. 

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