* Common Noun: This is the most basic form, simply referring to the general concept of a report. For example: "I need to write a report about the project."
* Concrete Noun: This refers to a tangible report, something you can physically hold. For example: "The report is on my desk."
* Abstract Noun: This refers to the act of reporting or the information itself, rather than a physical object. For example: "The news report was very detailed."
It's important to consider the sentence it's used in to determine the specific type of noun "report" is acting as.