bottle gourd vs calabash

bottle gourd and calabash both are nouns.

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

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

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

Other synonyms of bottle gourd include Lagenaria siceraria.

bottle gourd (noun)	calabash (noun)
Old World climbing plant with hard-shelled bottle-shaped gourds as fruits	bottle made from the dried shell of a bottle gourd
	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