Knowledge of wines is referred to as oenology, which is an 8-letter word. Oenology is the study of all aspects of wine and winemaking, including grape varieties, wine production, wine tasting, and wine pairing. It also includes the history of wine and its cultural significance. Oenology is a field of study that requires knowledge of chemistry, biology, and other sciences in order to understand the complexities of winemaking. Oenologists are experts in the field and can provide valuable insight into the production and enjoyment of wine.