Does the word "Guinness" refers to an alcohol? Are they always interchangeable?
Native speaker’s answer
Rebecca
Yes, Guinness is a popular brand of Irish beer. To answer your second question, no. "Guinness" and "alcohol" are not interchangeable, nor should they be interchangeable. The word "alcohol" is a broad term that groups all kinds of alcohol together: beer, wine, whiskey, vodka, gin, etc. "Guinness" is a particular kind of beer. When discussing alcohol, you have to be specific for others to know what kind of alcohol you are talking about.