The site's scope is much wider than that. Other things that are on topic include linguistics, grammar, punctuation, syntax, etymology, pronunciation, spelling, and much more.
You may have correctly observed that there are a lot of single word requests and the like. That may be because those are popular, and they fit well into the Q&A format of Stack Exchange. But they are by no means the only thing this site is for.
Here is an example of a meta post discussing a more outside-the-box type of question that many agree would be on-topic here.
Regarding the comment you received: I feel that the user wasn't necessarily expressing a dislike of single word requests in general. Note that he used the word "inane", which means "lacking sense or meaning; silly." So, most likely the user was expressing a dislike of questions that he feels have that quality.
Now, I don't agree with that user that your question was senseless or silly. Maybe there was such a word, in which case you could have gotten a good answer. The way for you to find that out was to ask the question. Anyway, the user may have been tired of all the single word requests (many of them silly, maybe) and used a comment on your question to vent about it. He may even have meant it as an innocent joke.
To sum up, this site has quite a wide scope. Most questions about the English language, or its use, that are not too broad, trivial or opinion based are on-topic. When asking, try searching the site first to see if your question has been asked before. You could use Google for this. Just type something like your question into Google, and at the end add
site:english.stackexchange.com If it's been asked before, then don't ask again. You can then instead vote, comment on (if requesting additional information) or answer the existing question.