When reviewing low-quality answers - particularly to [single-word-requests] - you will come across an answer which does more or less answer the question, but just lacks in detail. Currently the closest review option to "please add more detail" is the one for link-only answers.
Example:
Question: What is a word for __________?
Answer: This [word] and this [word].
The answer is not low quality per se because it suggests two valid words; however, it does not contain definitions. This is where we need an option such as:
Not enough detail
While the information you have included attempts to answer the question, more detail needs to be provided. Consider adding definitions or references to help improve your answer.