admin vs moderator

admin

noun
  • A user of a discussion forum, website, etc. with privileges allowing them to control or restrict the activity of other users. 

  • A systems administrator (one who maintains a computer system or network). 

  • Administration, or administrative work. 

  • An administration (a body that administers; the executive part of government). 

  • An administrator (one who administers affairs). 

verb
  • To serve as an administrator for or of. 

moderator

noun
  • A person who enforces the rules of a discussion forum by deleting posts, banning users, etc. 

  • An arbitrator or mediator. 

  • The person who presides over a synod of a Presbyterian Church. 

  • A substance (often water or graphite) used to decrease the speed of fast neutrons in a nuclear reactor and hence increase likelihood of fission. 

  • The chair or president of a meeting, etc. 

  • An examiner at Oxford and Cambridge universities. 

  • Someone who supervises and monitors the setting and marking of examinations by different people to ensure consistency of standards. 

  • A kind of lamp in which the flow of the oil to the wick is regulated. 

  • At the University of Dublin, either the first (senior) or second (junior) in rank in an examination for the degree of Bachelor of Arts. 

  • A mechanical arrangement for regulating motion in a machine, or producing equality of effect. 

  • A device used to deaden some of the noise from a firearm, although not to the same extent as a suppressor or silencer. 

  • Someone who moderates. 

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