Yes, basin is a Scrabble word!

Noun

1. A bowl-shaped vessel; usually used for holding food or liquids

2. The quantity that a basin will hold

3. A natural depression in the surface of the land often with a lake at the bottom of it

4. The entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet

5. A bathroom sink that is permanently installed and connected to a water supply and drainpipe; where you can wash your hands and face