Yes, you can install any version of macOS that was ever supported for your Mac. (It’s been a long time since they used System Enablers.) I’m so frustrated with Tahoe that I’m about to do this.
But you cannot, in general, migrate your data backwards. Apple's system apps will upgrade their data stores forward only. This isn't a problem if you are willing to e.g. re-download all of your (Mail.app) mail.
Safari can't be upgraded past a certain point on older versions of macOS. That can cause certain websites to break. Minor but annoying.