gulf

noun

1. an arm of a sea or ocean partly enclosed by land; larger than a bay

   noun.object

   Source: WordNet 3.0

2. an unbridgeable disparity (as from a failure of understanding)

   noun.attribute

   Examples

   He felt a gulf between himself and his former friends.

   Synonyms disconnect disconnection

   Source: WordNet 3.0

3. a deep wide chasm

   noun.object

   Source: WordNet 3.0

4. A hollow place in the earth; an abyss; a deep chasm or basin,

   noun

   Source: webster1913