That would be a linguist. Speech therapists help people with speech difficulties.
A Linguist.
Normally, the main language is the official language in a country. In countries without an official language, such as the United States, the main language is called the national language.
The Thai language is called Thai.
what is called table in marathi language
The native language of a people is called their mother tongue or first language.
Such a person is a specialist in language history, or a linguistic historian.
A flag specialist is called a vexillologist.
A Linguist.
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Such a specialist is known by the title of podiatrist or chiropodist.
A vocal specialist is called a Speech Therapist
A. Pediatricians
urologist
A climatologist
A "Roundsman"
Pneumocologist