Early Quenya
lasselanta
noun. the Fall, Autumn
ai lindórea lasselanta
*oh with singing at dawn Fall
ai lintuilind(ov)a lasselanta
*oh Fall with its many swallows
There are more words but they are from Tolkien's earlier conceptional periods. Tolkien likely changed these words as he evolved the aesthetics and completeness of the languages. You may even find languages that Tolkien later rejected. Do not mix words from different time periods unless you are familiar with the phonetic developments.
lasselanta
noun. the Fall, Autumn
ai lindórea lasselanta
*oh with singing at dawn Fall
ai lintuilind(ov)a lasselanta
*oh Fall with its many swallows
Below: Tolkien's Late Period (1950–1973). These are from Tolkien's late conceptual period — his most settled forms of the languages. Prefer these over the earlier ones above when composing new text.