A noun appearing as G. gavos “the yield, the crop, produce” in the Gnomish Lexicon of the 1910s based on the early root ᴱ√ı̯aƀa [YAɃA] (GL/38), since in Gnomish of the 1910s an initial y usually became g (HPG/§2.1).

Neo-Sindarin: The later iteration of this word was probably S. iavas “autumn” (LotR/1107). As this later meaning is significantly different, I would use ᴺS. iaust for “crop, *yield, produce” for purposes of Neo-Sindarin; see that entry for discussion.