a historian is a person who specializes in the study of history, and who writes books and articles about it, historian, chronicler, recorder, biographer, antiquarian

a doctor who studies and treats diseases of the nerves, neurologist

chronology, the study of history

scholar

(Botany( Botanist

gerontologist

chemist

A geographer is a person who studies geography or is an expert in it, geographer

a person who scientifically studies animals, zoologist

(Biology) a zoologist who studies fishes, ichthyologist

someone who studies or collects coins, paper money, or medals, numismatist

lamp of knowledge and action

a person who studies physics or whose job is connected with physics, physicist, physiologist

an expert in art and science

history of love

from the time when the conditions of the world became known

history of the world, universe

history of Arabs

the starting date

appearance date in a court of law

a solar year

set of words in which numbers associated with each letter are added together to yield a certain year

history of poetry

fixed date, the appointed day

Iranian legends

passing date of filing suit or first application

expert of art, skill

the one who is excellent in a skill

an expert linguist, a polyglot

an expert in a particular art or skill

astrologist

psychologist

criminologist

a person who studies physics or whose job is connected with physics, physicist

a person who studies human sexual behaviour, sexologist

someone who studies or is an expert in sociology, sociologist

a scientist who studies biology, biologist

architect

toxicologist

(Medical) a physician

educationist

someone who studies, teaches, or is an expert in mathematics, mathematician

a person who scientifically studies animals, zoologist

expert in war-related matters

physiologist

economist

educationist, expert in teaching

a person who studies or has a special knowledge of economics, economist

Graphologist.

botanist