labor, laborer

Definition:

The term "labor" refers to doing hard work of any kind.

In general, labor is any task which uses energy. It is often implied that the task is difficult.
A laborer is a person who does any type of labor.
In English, the word "labor" is also used for part of the process of giving birth. Other languages may have a completely different word for this.
Ways to translate "labor" could include "work" or "hard work" or "difficult work" or "to work hard."