When describing someone or something that does the work of another, there are several synonyms that can be used to convey the same idea. Some options include "performs the duties of," "serves as a replacement for," "acts as a stand-in for," "fulfills the role of," "takes over for," and "substitutes in the place of." These phrases all indicate that the person or thing being discussed is capable of handling the responsibilities or tasks assigned to them, and can do so in a competent and effective manner. Overall, choosing the right synonym for "does the work of" can help to make your writing more vibrant and engaging.