My understanding is a remaster would involve enhanced visuals, maybe re-recorded lines and such, but otherwise is the same exact game and engine.

A remake would be starting over from scratch, rebuilding with perhaps a new engine, more than a face-lift.

I find remakes to usually have slightly larger maps, more fluid gameplay, maybe new features that didn’t exist in the original.

This appears to be a decent article about the topic. https://retrostylegames.com/blog/difference-between-remake-and-remaster/

I think there’s a place for good remakes and remasters, especially for very old games, and games not originally released on many platforms. But the industry has come to abusing them just to churn out more.