Combust is a commonly used term in the field of science and engineering, but it also has many synonyms that can be used in everyday language. Some of the most common synonyms for combust include burn, ignite, incinerate, and blaze. Other synonyms that can be used in place of combust include smolder, char, singe, and scorch. Each of these words describes the process of something being set on fire or burned, and can be used interchangeably with combust. Whether you are discussing a chemistry experiment or describing a campfire, there are many different words that can be used in place of combust to make your writing more varied and interesting.