A very deep, narrow opening in rock, ice, or the ground (Cambridge)
(between A and B) (formal) a very big difference between two people or groups, for example because they have different attitudes (Oxford)
The ground dropped away into an awesome chasm. (Oxford)
There is still a vast economic chasm between developed and developing countries. (Cambridge)
dropped away into an awesome chasm
a vast economic chasm
Hole
Blank
Closing
Junction
Chasmic