Tolkien created Quenya as the language of the High Elves associated with Valinor.
Quenya is one of Tolkien’s most developed invented languages. Its sound and structure were influenced especially by Finnish, while its history within Middle-earth connects it with the Elves who journeyed to the Undying Lands and with later learned or ceremonial usage.
Sindarin is a different Elvish language, descended from the speech of the Elves who remained in Middle-earth. In The Lord of the Rings, Sindarin is generally more widely spoken among the Elves encountered by the characters, while Quenya often carries an older, formal, or literary status.
Tolkien did not invent just a vocabulary list. He created historical relationships, sound changes, scripts, and imagined communities for his languages. This linguistic approach helped generate names and histories rather than merely decorating a pre-existing fictional world.