A Linguist.
A language expert is commonly referred to as a linguist. Linguists study the structure and usage of language, including grammar, syntax, semantics, and phonetics.
A person who is an expert in grammar is called a linguist or a grammatician.
A linguist is a person who is an expert in language or languages, including the structure, meaning, and use of languages. They often study the historical development of languages and their significance in different cultures.
They are called "linguistic or language communities."
A person who does sign language is called a "sign language interpreter" or a "signer."
Expert, Knowledgeable, etc..
linguist
pullicologist
a semanticist
A language expert is commonly referred to as a linguist. Linguists study the structure and usage of language, including grammar, syntax, semantics, and phonetics.
An expert at table talk is called a deipnosophist.
Horologist
A mathematician.
Horologist
Horologist
A toxicologist is an expert in poisons and their effects on living organisms.
A cloudologist, or a meteorologist.