I know the study is called linguistics, but I don't know what the person is called.
Someone who studies speech is called a speech pathologist or a speech-language pathologist.
A person who studies phonetics is called a phonetician. Phonetics is the branch of linguistics that deals with the sounds of speech, their production, and reception. Phoneticians examine the physical properties of speech sounds and how they are used in different languages.
A person who studies writing can be called a linguist or a philologist, depending on the specific focus of their study. They may also be referred to as a literary scholar or a composition specialist.
"Summons" can be either a noun or a verb. As a noun, it refers to an official order to appear before a court or a call to someone to be present. As a verb, it means to issue such an order or to call someone to come.
A person who studies languages is called a linguist.
A short speech is often referred to as a "brief address" or a "mini speech."
You call someone that studies metal a metallurgist.
A physicist.
a person who studies planets is a planetologist.
There is no special name for someone who studies Hebrew.
An Anthropologist.
malacologist
euclidist
Gemologists
psychologist
A numismatist.
A Zoologist
a meteorologist.