"Acting a part" is a phrase commonly used to describe the act of pretending to be something or someone else. However, there are many synonyms for this phrase that can be used to add variety and depth to your writing. Some possible synonyms for "acting a part" include pretending, impersonating, feigning, embodying, portraying, assuming a role, playing a character, or putting on a show. Each of these words carries its own connotations and shades of meaning, allowing you to choose the right word to convey exactly the tone and intention you are looking for in your writing.