appellative vs initials

appellative

noun
  • an epithet 

  • a common noun 

adj
  • Of or pertaining to ascribing names. 

  • Of or pertaining to an appellative noun or common noun. 

initials

noun
  • An abbreviation of a person's name, constructed by taking the initial letters of first, last, and sometimes middle name(s). See monogram 

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