councilmember vs deputation

councilmember

noun
  • A councilman or councilwoman; member of a council. 

deputation

noun
  • The person or persons deputed or commissioned by another person, party, or public body to act in his or its behalf; a delegation. 

  • The act of deputing, or of appointing or commissioning a deputy or representative; office of a deputy or delegate; vicegerency. 

  • Among Christian missionaries, the process or period of time during which they raise support in preparation for going to their mission field. 

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