as a perk vs honorary

as a perk

honorary

adj
  • Given as an honor/honour, with no duties attached, and without payment. 

  • Voluntary. 

  • Describes the holder of an unofficial position or title that is assigned as a special honor rather than by normal channels. 

noun
  • A person who holds an honorary appointment. 

  • A kind of secret society that operates in name only, with membership given to honor some achievement. 

  • An honorarium; a fee for services of no fixed value. 

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