-ist (Greek > Latin: a suffix; one who believes in; one who is engaged in).antagonist: 
apologist: 
archeologist: 
bigamist: 
biologist: 
cardiologist: 
chemist: 
chiropodist: 
communist: 
dentist: 
dermatologist: 
dramatist: 
entomologist: 
evangelist: 
gastrologist: 
geologist: 
gerontologist: 
graphologist: 
gynecologist: 
herpetologist: 
ichthyologist: 
internist: 
microbiologist: 
monarchist: 
naturalist: 
neurologist: 
oculist: 
ophthalmologist: 
optometrist: 
ornithologist: 
orthodontist: 
orthopedist: 
pathologist: 
phonologist: 
phrenologist: 
podiatrist: 
psychiatrist: 
psychologist: 
scatologist: 
seismologist: 
socialist: 
spelologist: 
symbolist: 
terrorist: 
toxicologist: 
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