Gulf (noun)

1. A large sea or ocean inlet, typically narrower than a bay, and extending into the land.
2. A wide or deep split or divide in the earth or another surface.
3. A large, deep, or dangerous difference or disparity.
4. A wide or deep chasm or abyss.
5. A large or deep area of water.

Origin:

Old english gulf, gylph, of germanic origin; related to dutch golf and german golf, from a base meaning "swallow".

Examples:

1. The Gulf of Mexico is a large sea inlet between Mexico and the United States.
2. The Gulf Stream is a warm ocean current.
3. The Gulf of Aden is a crucial waterway for international shipping.
4. The Gulf War was a conflict in the early 90s.
5. The Gulf between the two countries' economies is growing.