A grammarian is a person who studies grammar and syntax. They are experts in the field of grammar. It is they who create the traditional rules of grammar that we all know and love here at thewordiswhom.com. Grammarians can be either prescriptive or descriptive.
There are many different types of language professionals besides grammarians. Linguists often take a broader and more descriptive approach when it comes to language. They do not focus solely on proper language use, but also on the history and evolution of languages, as well as dialect and how native speakers use languages. The word grammatist is often synonymous with grammarian, but grammatists are considered more prescriptive and pedantic. A lexicographer is a person who helps to create a dictionary. They could write the preface, compile the words, or be the dictionary's editor. These are just a few examples of professions in the field of language, and if you continue to explore the complex world that is language, you could be one of these in the future!