Noun geek has 2 senses
  1. geek - a carnival performer who does disgusting acts
    --1 is a kind of
    performer, performing artist
  2. eccentric, eccentric person, flake, oddball, geek - a person with an unusual or odd personality
    --2 is a kind of anomaly, unusual person
    --2 has particulars:
     crackpot, crank, nut, nut case, nutcase, fruitcake, screwball; nutter, wacko, whacko