Carbonyl compound is a broad term used to describe any organic compound that contains a carbon-oxygen double bond, also known as the carbonyl group. Some common synonyms for carbonyl compounds include aldehydes, ketones, esters, and carboxylic acids. Aldehydes are carbonyl compounds that have a hydrogen atom attached to the carbonyl group, while ketones have two carbon groups attached to the carbonyl group. Esters are a type of carbonyl compound that is formed by the reaction between an alcohol and a carboxylic acid, while carboxylic acids are organic compounds that contain a carboxyl group (-COOH). By using these synonyms for carbonyl compounds, scientists can accurately categorize and describe the properties of these important organic compounds in various chemical reactions and processes.