Every cognac is a brandy, but not all brandy is a cognac. As previously mentioned, brandy is distilled fruit juice, and it can be any kind of fruit juice, while cognac is a specific type of distilled fruit juice with lots of qualifications.
The terms “spirits” and “liquor” are often used interchangeably to refer to any alcoholic beverage that has been distilled. However, some people use the term “liquor” to refer specifically to distilled beverages that are not aged, such as vodka and gin. Liquor is an alcoholic drink produced by the distillation of grains, fruits, vegetables, or sugar that have already gone through alcoholic fermentation. Other terms for liquor include: spirit, distilled beverage, spirituous liquor or hard liquor.