When the work is at its highest point, it can be referred to as the pinnacle of work. The summit of work is another synonym that can be used to describe the peak of work. The acme of work is also another way to describe when work is at its highest level. When referring to the peak of work, you can also use the term the apex of work. If the work is at its climax, it is also referred to as the zenith of work. At the top of the workload, some people may choose to use the phrase the crest of work. All of these synonyms can be used interchangeably to describe when work is at its highest point.