So pretty sure about everyone on this website knows about this inconsistency, but just in case you don’t, here is a run down.
The Nether is a hot, hot place. Its main color is red and full of lava. It is the deepest “Biome” in the game, hence the name.
The Nether Zone is a cave biome located in the -2000s. It is a frosty place, mostly consisting of ice and other frozen blocks. It’s main color is blue. It also has mushroom cap trees called Nether Caps that can freeze water instantly. It is not the deepest biome in the game, and thus the name makes no sense.
And just from reading those two descriptions you can probably tell what I’m getting at. Can we please change the name of the trees to make it consistent and not confusing?