Carbonyl is a chemical group that contains a carbon atom double-bonded to an oxygen atom. There are several synonyms that can be used to describe this functional group, which are commonly used in organic chemistry. For example, some of the most common synonyms for carbonyl include oxo group, keto group, and aldehyde group. The term "carbonyl" is often used interchangeably with "ketone" and "aldehyde," which are both types of organic compounds that contain the carbonyl functional group. Other less commonly used synonyms for carbonyl include carbonyl group, carbonylic group, and acyl group. Regardless of the specific term used, the carbonyl functional group plays a critical role in many important biological and chemical processes.