General Language Expertise:
* Linguist: This is the broadest term, encompassing anyone who studies language in its entirety, including its structure, history, and use.
* Language specialist: This is a broader term than linguist and may include experts in specific areas like language teaching, translation, or interpretation.
* Language scholar: This term can be used for someone with advanced knowledge of a specific language or group of languages, often through academic research.
Specialized Language Experts:
* Linguistic analyst: Analyzes and describes language structures and patterns.
* Language teacher: Educates others in the use of a specific language.
* Translator: Converts written text from one language to another.
* Interpreter: Converts spoken language from one language to another.
* Lexicographer: Compiles and edits dictionaries.
* Etymologist: Studies the history and origins of words.
* Sociolinguist: Studies how language varies and is used within different social groups.
* Computational linguist: Studies the computational aspects of language, including natural language processing.
Other terms:
* Polyglot: A person who knows and is able to use many languages.
* Philologist: Studies the history and development of languages, especially the relationship between languages and texts.
The best term to use depends on the specific context and the expert's area of expertise.