What is a synonym for toil?

The word "toil" primarily refers to hard work or labor, often with a connotation of continuous effort and struggle. Therefore, "labor" serves as an appropriate synonym because it also denotes physical or mental effort in work.

In contrast, the other options provide meanings that do not align with the concept of sustained effort. "Rest" implies a cessation of work, "ease" suggests comfort or a lack of effort, while "vacate" means to leave or empty a place, which has no connection to the idea of hard work or effort. Thus, the term "labor" captures the essence of "toil," making it the correct choice.