A scientist that studies bears would be called an ursinologist.
An aviologist.
pomology
Gunsmith? look at the yahoo Canada answer for this.
A scientist that studies motion, forces and energy would be called a physicist.
A biotechnology scientist.
An Oceanographer. Marine Biologist, that sort of thing.
A scientist that studies viruses is called a virologist.
A scientist who studies mollusks is called a malacologist.
A scientist that studies bears would be called an ursinologist.
An aviologist.
biologist
virologist
A meteorologist.
astronomer
Mineralogists
A vulcanologist