Ok ... so I presume the following ...
Great Kingdom ... human
The Horde ... rats
Lords of the Wild ... elfs
Underearth dwellers ... o&g
Otherworld ... demons
Undead Legions ... undead
How close am I?
There is more freedom with the boards with what they represent. Thinking in warhammer Old World terms.
Great Kingdoms - any civilized kingdom; humans, high/dark elves, and dwarfs/chaos dwarfs.
The Horde - barbarians; Norse, Chaos Marauders, Orcs, and Skaven.
Lords of the Wild - tree folk/wild/nomadic; Wood Elves, Beastmen, Lizardmen, and Forest Goblins.
Masters of the Underearth - Dwarfs/Chaos Dwarfs, Goblins, and Skaven.
Otherworld - angel/insubstantial/nightmare creatures; Chaos Daemons, Lizardmen (more AoS version).
Undead Legions - the Undead; Vampire COunts/Tomb Kings; and classic Undead.