Sets fire is a common phrase used to describe the act of igniting flames or starting a fire. However, using the same phrase repeatedly can become monotonous in your writing. To add some variation, there are several synonyms for sets fire that you can use such as kindle, ignite, light up, spark, inflame, and blaze. Each of these words carries a slightly different meaning and can add depth to your writing. For instance, kindle refers to the act of starting a small fire, while inflame connotes a more intense or passionate fire. Using these synonyms can help you keep your writing fresh and interesting, while still conveying your intended meaning.