What is the lover of language called?

A person who loves linguistics or the study of language is often referred to as a "linguaphile." This term is not as commonly used as "language enthusiast," which refers to someone who has a strong interest in language in general. You could also use the term "polyglot," which refers to someone who speaks multiple languages.

Most of the time, the word “linguaphile” is used to describe someone who speaks more than one language because they love learning them. But to be a linguaphile, you don’t have to be fluent in more than one language. Linguaphiles are passionate about language because of the myriad of expressive possibilities it offers.
This word comes from the Greek words “phile” for “lover” and “lingua” for “language.” Linguists are often interested in studying the structure of language, such as grammar, syntax, and meaning. They might also be interested in the history and development of language, as well as the social and cultural aspects of language use. Some linguaphiles are professional linguists, but others are just interested in languages for their own sake.