The Elvish language Tolkien created for the people of Valinor is Quenya. It is one of Tolkien’s most developed invented languages and is associated especially with the High Elves, including the Noldor.
Tolkien modeled aspects of Quenya’s sound and structure on languages he admired, particularly Finnish, while also giving it its own grammar, vocabulary, and historical evolution. He did not invent it merely as a list of decorative words; he developed it as part of a fictional linguistic history.
Quenya is distinct from Sindarin, another major Elvish language. Sindarin became the everyday Elven language of much of Beleriand and later Middle-earth, whereas Quenya had a more formal, ceremonial, or scholarly role in many settings.
Khuzdul is the language of the Dwarves, and Adûnaic is associated with Númenor. Their inclusion in Tolkien’s linguistic system shows how language, ancestry, and migration are connected throughout the legendarium.