Ester vs. Carbonyl: What's the Difference?

Ester and Carbonyl Definitions
Ester
Any of a class of compounds derived from an oxyacid, usually resulting from the reaction of an oxyacid and an alcohol with the elimination of water.
Carbonyl
The bivalent group C=O.
Ester
(organic compound) A compound most often formed by the condensation of an alcohol and an acid, with elimination of water, which contains the functional group carbon-oxygen double bond (i.e., carbonyl) joined via carbon to another oxygen atom.
Carbonyl
A metal compound, such as Ni(CO)4, containing the CO group.
Ester
An ethereal salt, or compound ether, consisting of an organic radical united with the residue of any oxygen acid, organic or inorganic; thus the natural fats are esters of glycerin and the fatty acids, oleic, etc.
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Carbonyl
(organic chemistry) In organic chemistry, a divalent functional group, (-CO-), characteristic of aldehydes, ketones, carboxylic acids, amides, carboxylic acid anhydrides, carbonyl halides, esters and others.
Ester
Formed by reaction between an acid and an alcohol with elimination of water
Carbonyl
(inorganic chemistry) Any compound of a metal with carbon monoxide, such as nickel carbonyl, Ni(CO)4.
Carbonyl
The radical (CO)´´, occuring, always combined, in many compounds, as the aldehydes, the ketones, urea, carbonyl chloride, etc.
Carbonyl
A compound containing metal combined with carbon monoxide
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Carbonyl
Relating to or containing the carbonyl group