The phrase "play a part" means to contribute or have a role in a particular situation. However, there are several synonyms for the phrase that can be used interchangeably. These synonyms include "participate," "contribute," "assist," "involve," "play a role," "have a hand in," and "be a factor in." Other alternatives include "take part," "engage," "partake," "be involved," and "have a share in." All of these phrases convey the same meaning as "play a part" and can be used in various contexts, such as in discussions about teamwork, problem-solving, or social interactions.