chasm

Concise Oxford English Dictionary © 2008 Oxford University Press:
chasm /ˈkaz(ə)m/

▶noun

• 1 a deep fissure.

• 2 a profound difference between people, viewpoints, feelings, etc.

– derivatives
chasmic adjective (rare).

– origin C16: from L. chasma, from Gk khasma ‘gaping hollow’.