μόχθος (móchthos|mokh'-thos|noun|toil; labor)
[Grk] μόχθος LN: 42.48 GK: G3677 Hebrew: אָוֶן‎, יָגֹון‎, יְגִיעַ‎, עָמָל‎, פְּעֻלָּה‎, פֶּרֶךְ‎, תְּלָאָה‎
Derivation: from the base of μόγις;
Strong's: toil, i.e. (by implication) sadness
KJV: --painfulness, travail.
See: μόγις