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.
A verb appearing in the form ᴱQ. yavin “bears fruit” in the Qenya Lexicon of the 1910s under the early root ᴱ√ẎAVA having to do with fruit (QL/105).
Neo-Quenya: Since ᴹ√YAB “fruit” survived in Tolkien’s later writings, I think ᴺQ. yava- “to bear (fruit), ✱yield, bring forth, produce” can be retained for purposes of Neo-Quenya.