abyss
[noun]
Synonyms: pit, chasm, crevasse, fissure, gorge, gulf, void

[TahlilGaran] English Synonym Dictionary ▲

a‧byss /əˈbɪs/ noun [countable]
[Date: 1300-1400; Language: Late Latin; Origin: abyssus, from Greek, from abyssos 'bottomless', from a- 'without' + byssos 'depth']

1. a very dangerous or frightening situation
abyss of
The country might plunge into the abyss of economic ruin.
At that time Bosnia was standing on the edge of an abyss.

2. a deep empty hole in the ground

3. a very big difference that separates two people or groups:
the gaping abyss between these grand buildings and my own miserable home

[TahlilGaran] Dictionary of Contemporary English ▲