There are several words that can be used to replace the phrase "pull a face". One alternative could be "make a face", which is a more common and general expression used to describe various facial expressions that convey emotions such as disgust, surprise, or confusion. Another synonym could be "grimace", which refers specifically to a facial expression of pain or discomfort. "Frown" is another term, which refers to a furrowed brow that signifies disapproval or unhappiness. "Gurn" is a colloquial term that denotes a silly or exaggerated facial expression, typically for amusement or entertainment purposes. In conclusion, there are various synonyms for "pull a face" depending on the context and the intended meaning behind the facial expression.