General synonyms:
* Bowl: This is a very common synonym, especially for a basin used for washing.
* Container: This is a more general term for any object that holds something.
* Receptacle: Similar to "container," but emphasizes the purpose of holding something.
* Depressed area: This is a more literal description of a basin's shape.
Specific synonyms depending on the context:
* Washbasin: This is a basin specifically used for washing.
* Sink: Another common term for a washbasin.
* Cisterna: A basin used for storing water, especially in older buildings.
* Valley: A basin-shaped depression in the earth's surface.
* Catchment area: This refers to the area that drains into a basin, like a river basin.
Example:
* "I washed my hands in the basin." (Could be replaced with "bowl", "washbasin", or "sink")
* "The basin of the river held a large amount of water." (Could be replaced with "valley" or "catchment area")
It's important to choose the synonym that best fits the specific meaning and context of the original sentence.