fellow vs insider

fellow

noun
  • A (senior) member of a learned or professional society. 

  • A person or thing comparable in characteristics with another person or thing; especially, as belonging to the same class or group. 

  • A companion; a comrade. 

  • An honorary title bestowed by a college or university upon a distinguished person (often an alumna or alumnus). 

  • A senior researcher or technician in a corporation, especially one engaged in research and development. 

  • A male person; a bloke, a chap, a guy, a man; also, preceded by a modifying word, sometimes with a sense of mild reproach: used as a familiar term of address to a man. 

  • A member of a college or university who manages its business interests. 

  • An animal or object. 

  • An object which is associated with another object; especially, as part of a set. 

  • A scholar appointed to a fellowship, that is, a paid academic position held for a certain period which usually requires the scholar to conduct research. 

  • A senior member of an Inn of Court. 

  • Originally, one of a group of academics who make up a college or similar educational institution; now, a senior member of a college or similar educational institution involved in teaching, research, and management of the institution. 

  • Usually qualified by an adjective or used in the plural: an individual or person regardless of gender. 

  • A person with abilities, achievements, skills, etc., equal to those of another person; a thing with characteristics, worth, etc., equal to those of another thing. 

  • A physician undergoing a fellowship (supervised subspecialty medical training) after having completed a residency (specialty training program). 

  • An animal which is a member of a breed or species, or a flock, herd, etc. 

  • One in the same condition, or situation of need, as another. 

insider

noun
  • A person who has special knowledge about the inner workings of a group, organization, or institution. 

  • A person who is within an enclosed space. 

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