The mesa is also actually badlands, and the pillager beast is actually ravager. End pillars are called end spikes. The outer islands are 3 different biomes (in Java. In bedrock, it's the same): Highlands (the centre), lowlands (The edge) and midlands (everything inbetween). Extreme hills aren't actually called that. They are called mountains (I don't know what the new mountains will be called). Mobs are actually called monsters. Mob spawners are really dungeons, and the central block is a monster spawner. The game just distinguishes between passive (animals) and not passive (monsters).