A:AnswerThe short answer is "not as easily as an Intel-based iMac" because there is not a commercial Windows 10 that you can buy that runs on ARM-based processors like this new M1-based iMac. The Windows 10 that runs on this processor family is only available as a "preview" download and is intended for developers since Microsoft does sell their own hardware on this processor family (some of their Surface products).
You might have some limited success using Crossover for M1 Macs but this is not the same kind of compatibility that you get with an Intel Mac where you can just literally run real (Intel) x64 Windows 10 in a virtual machine.
A:AnswerWord is not included on the iMac. it can be purchased thru the App Store. I bought a yearly subscription to Microsoft Office 365. I do not know about other options to get Word
A:AnswerThe operating system on this Mac supports installation of certain apps that were actually designed for the iPhone or iPad; happily, Among Us is one of the apps available (you can download it from the built-in "App Store"). Once installed, it will run on this Mac just fine!
Roblox is also available for the Mac. You can download it from Roblox.com.