calabash vs bottle gourd

calabash and bottle gourd both are nouns.

Word	Noun	Adjective	Verb	Adverb
calabash	Yes	No	No	No
bottle gourd	Yes	No	No	No

As nouns, calabash and bottle gourd are synonyms defined as:

calabash and bottle gourd: Old World climbing plant with hard-shelled bottle-shaped gourds as fruits

Other synonyms of calabash include Lagenaria siceraria.

calabash (noun)	bottle gourd (noun)
bottle made from the dried shell of a bottle gourd	Old World climbing plant with hard-shelled bottle-shaped gourds as fruits
a pipe for smoking; has a curved stem and a large bowl made from a calabash gourd
tropical American evergreen that produces large round gourds
round gourd of the calabash tree
Old World climbing plant with hard-shelled bottle-shaped gourds as fruits