* Θερισμός (therismos): This refers specifically to the harvesting of grain.
* Συγκομιδή (sygkomidhi): This is a more general term for harvesting, encompassing a wider range of crops and activities. It literally translates to "gathering together."
* Τρύγος (trygos): This refers specifically to the grape harvest.
So, the best choice depends on what you're harvesting. For general use, συγκομιδή (sygkomidhi) is likely the most appropriate.