onomastician on·o·mas·tics /ˌɒnəˈmæstɪks/ [on-uh-mas-tiks] -noun (used with a singular verb) the study of the origin, history, and use of proper names.
(taken from dictionary.com)
The have several names that they can be called by, including volcanist, volcanologist, and historically, vulcanologist.
The Person Who studies about mamals , he is called mamalogist....
A person who studies volcanoes is called a volcanologist.
A person who studies the grass and soil, etc. is called a Agrostologist
A person who studies or writes history is called a historian.
A person who studies the mind and behavior is called a psychologist.
A person who studies geology is a geologist.
A person who studies culture is called an anthropologist.
a person that studies gems is called a gemologist.
A person who studies bees is called an apiologist.
People who study Earth's surface features are called geographers. Their names are unknown to the masses.
A person who studies the grass and soil, etc. is called a Agrostologist