Yes, calabash is a Scrabble word!

Noun

1. Round gourd of the calabash tree

2. Tropical American evergreen that produces large round gourds

3. Old World climbing plant with hard-shelled bottle-shaped gourds as fruits

4. Bottle made from the dried shell of a bottle gourd

5. A pipe for smoking; has a curved stem and a large bowl made from a calabash gourd