gastroenterologist a physician who specializes in diseases of the gastrointestinal tract
numerologist a believer in numerology
cosmetologist an expert in the use of cosmetics
responsibility the social force that binds you to a course of action
craniologist someone who claims to be able to read your character from the shape of your skull
gerontologist a specialist in gerontology
criminologist a specialist in criminology
cryptologist someone skilled in devising, analyzing, or deciphering codes
cosmologist an astronomer who studies the evolution of the universe
graphologist a specialist in inferring character from handwriting
gynecologist a specialist in gynecology
rheumatologist a physician specializing in rheumatic diseases
gynaecologist a specialist in gynecology
speleologist a person who explores caves
astrologist someone who predicts the future by the positions of the planets and sun and Moon
ornithologist a scientist who studies birds
spelaeologist a person who explores caves
serologist a medical scientist who specializes in serology
epidemiologist a specialist who studies the spread and control of diseases
herpetologist a scientist who studies reptiles and amphibians