A person who knows many languages is called a polyglot.
A person who knows three languages is typically referred to as a trilingual.
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Polyglot
A person who knows two languages is called a bilingual.
People who can speak many languages are called polyglots or multi-lingual.
Trilingual
It is difficult to determine a single person who knows the most languages, as there are various individuals who claim proficiency in dozens or even hundreds of languages. However, hyperpolyglots like Ziad Fazah and Giuseppe Caspar Mezzofanti are often cited as some of the most accomplished language learners.
Polyglot- One who knows many languages. These other definitions come from Wikipedia under the term Polyglot: * Multilingualism, a single speaker who uses two or more languages, or a community of speakers where two or more languages are used * Hyperpolyglot, one who can speak six or more languages fluently
A linguist is a specialist who studies the structure and patterns of language as well as the history and development of words. They analyze linguistic data, such as phonetics, syntax, and semantics, to understand how languages function and evolve over time.
A person who can speak different languages is called a polyglot.
A person with two languages is bilingual. A person with three or more is multilingual. Looking for a word that describes the exact number of languages would seem disingenuous.