Here's a breakdown:
* Anthology: This term typically refers to a collection of literary works, often with a unifying theme or genre. However, it can also encompass collections of non-literary works like essays or speeches.
* Collection: This is a broad term that simply indicates a gathering of various materials, including works by different authors.
* Critical study: This term specifically implies that the writer is analyzing and interpreting the collected works, going beyond simple compilation.
The specific term that best fits the situation would depend on the nature and purpose of the work.
For example, if the writer is simply compiling a collection of essays on a specific topic, "anthology" or "collection" would be appropriate. However, if the writer is offering their own analysis and interpretation of the collected works, "critical study" would be more accurate.