The term "barstooler" refers to a person who spends a lot of their time sitting on a barstool, often in a pub or bar. However, there are many other words that can be used to describe such a person. For instance, you could say they are a "regular," a "pub-goer," or a "barfly." Other terms include "drinker," "imbiber," or "tippler." Alternatively, if you want to focus on the sitting aspect, you could use words like "lounger," "percher," or "sitter." Whatever term you choose, just remember that it's important to avoid stigmatizing language and to treat others with respect, regardless of their habits or hobbies.