All of the following are referred to as alcohol, except?

In the context of the question regarding types of alcohol, the term "alcohol" specifically refers to a category of chemical compounds characterized by the presence of one or more hydroxyl (-OH) groups. Among the options provided, "Distilled" is not a type of alcohol but rather a process used to separate components of a liquid mixture based on their boiling points. Distillation can be used to produce alcoholic beverages, but it does not define an alcohol itself.

The other terms relate directly to specific types of alcohol. "Fermented" refers to the process through which alcohol is produced, typically from sugars by the action of yeast. "Ethyl" (or ethanol) is a common type of alcohol found in alcoholic beverages and used as a solvent. "Isopropyl" refers to isopropyl alcohol, commonly used as a disinfectant or antiseptic. While these three options each depict a form of alcohol, "Distilled" describes a method, thus confirming its distinction from actual types of alcohol.