* Noun: This is the most common use. It refers to the act of gathering something together.
* Example: "The police conducted a roundup of suspects."
* Verb: It can mean to gather together or assemble.
* Example: "We need to roundup all the supplies for the trip."
* Adjective: Though less common, it can describe something that is comprehensive or inclusive.
* Example: "They provided a roundup of the day's news."
It's important to consider the context to determine the correct part of speech.
Note: "Roundup" can also be a brand name for a herbicide.