What is the Greek word for travail?

There isn't one single perfect Greek word for "travail," as the word encompasses both physical labor and suffering/toil. Depending on the nuance you want to convey, several options exist:

* πόνος (ponos): This is probably the closest single word. It means "pain," "suffering," "toil," or "labor," and encompasses both the physical and mental aspects of travail.

* μόχθος (mochthos): This word emphasizes arduous labor and toil, often implying strenuous effort and hardship.

* κόπος (kopos): This refers to weariness and fatigue resulting from hard work. It highlights the exhaustion aspect of travail.

The best choice will depend on the context. If you're describing the physical labor, πόνος (ponos) or μόχθος (mochthos) might be suitable. If you're focusing on the suffering and exhaustion, κόπος (kopos) or πόνος (ponos) are better options.