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Other than saying the person is a "specialist in..." or a "... major" (if in college), there's the use of the suffix "-logist" or "-ologist" for experts/scholars in particular fields: antropologist, paleontologist, mineralogist, theologist, meteorologist, biologist, bacteriologist... "TheEnglish suffix -ology or -logydenotes a field of study or academicdiscipline, and -ologist describes a person who studies that field. (source: http://en.wikipedia.org/wiki/List_of_ologies#List_of_-ologies)
What else can I help you with?
What do you call someone who studies a certain subject as a hobby?
He is called an "Amateur"
What do you call some one that studies metal?
You call someone that studies metal a metallurgist.
What do you call someone who studies human behavior?
You'd call them a sociologist if they study society and group behavior or a psychologist when it involves just one subject.
What do you call someone who studies?
A physicist.
What do you call someone that studies planets?
a person who studies planets is a planetologist.
What do you call someone who studies Hebrew?
There is no special name for someone who studies Hebrew.
What do you call someone who studies plants?
florist
What do you call someone who studies people?
An Anthropologist.
What do you call someone who studies germs?
Microbiologists
What do you call someone who studies badgers?
Brocollogist
What do you call someone who studies fauna?
A Zoologist
What do you call someone who studies molluscs?
malacologist
