adumbration vs tropology

adumbration

noun
  • A faint sketch; a brief representation, an outline. 

  • The state of being in shadow or shade; (countable) a shadow. 

  • The outline of a charge (“image displayed on an escutcheon”), sometimes filled in with a darker shade than the field. 

  • The form of an object as seen by an observer. 

  • A rough or symbolic representation; a vague indication of what is to come, a foreshadowing. 

tropology

noun
  • A recurring motif or metaphor, a trope; an interplay of tropes. 

  • The use of a trope (metaphor or figure of speech). 

  • The interpretation of scripture or other work in order to educe moral or figurative meaning; a treatise of such interpretation. 

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