It’s hard to know what to use as a word these days. I try to stay accurate in my wording of things. I tend to say Era but have been saying “Classic 2019” for certain things or have used the patch numbers.
Saying that a dev said this in a blue post about the “World of Warcraft Classic” whole area, including SoD, a few days ago, which was interesting. So maybe even they flip between wording: