octet vs musical organisation

octet and musical organisation both are nouns.

Word	Noun	Adjective	Verb	Adverb
octet	Yes	No	No	No
musical organisation	Yes	No	No	No

As nouns, musical organisation is a hypernym of octet; that is, musical organisation is a word with a broader meaning than octet:

Other hypernyms of octet include musical group, musical organization.

octet (noun)	musical organisation (noun)
a musical composition written for eight performers	an organization of musicians who perform together
eight people considered as a unit
a set of eight similar things considered as a unit
eight performers or singers who perform together
the cardinal number that is the sum of seven and one