Early Quenya
yávan
noun. harvest, autumn
silkesse
noun. harvest
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.
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.
A noun appearing as ᴱQ. silkesse “harvest” in the Qenya Lexicon of the 1910s under the early root ᴱ√SḶKḶ that was also the basis for “grass” words (QL/84).
Conceptual Development: The Etymologies of the 1930s updated this root to ᴹ√SALAK+wē for “grass” words (Ety/SALÁK), so I think this Early Qenya word can be updated to ᴺQ. salcessë “harvest”. I would assume this word refers to the product of a harvest = “✱produce”, as opposed to yávië which is the time or act of harvesting.