bassoon vs double reed

bassoon and double reed both are nouns.

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

As nouns, double reed is a hypernym of bassoon; that is, double reed is a word with a broader meaning than bassoon:

bassoon: a double-reed instrument; the tenor of the oboe family
double reed: a woodwind that has a pair of joined reeds that vibrate together

Other hypernyms of bassoon include double-reed instrument.

bassoon (noun)	double reed (noun)
a double-reed instrument; the tenor of the oboe family	a pair of joined reeds that vibrate together to produce the sound in some woodwinds
	a woodwind that has a pair of joined reeds that vibrate together