abysm

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a bottomless gulf or pit;
any unfathomable (or apparently unfathomable) cavity or chasm or void extending below (often used figuratively)
• Syn:
abyss
• Derivationally related forms:
abysmal, abyssal (for: abyss)
• Hypernyms:
chasm