double bassoon vs contrafagotto

double bassoon and contrafagotto both are nouns.

Word	Noun	Adjective	Verb	Adverb
double bassoon	Yes	No	No	No
contrafagotto	Yes	No	No	No

As nouns, double bassoon and contrafagotto are synonyms defined as:

double bassoon and contrafagotto: the bassoon that is the largest instrument in the oboe family

Other synonyms of double bassoon include contrabassoon.

double bassoon (noun)	contrafagotto (noun)
the bassoon that is the largest instrument in the oboe family	the bassoon that is the largest instrument in the oboe family