note value vs continuance

note value and continuance both are nouns.

Word	Noun	Adjective	Verb	Adverb
note value	Yes	No	No	No
continuance	Yes	No	No	No

As nouns, continuance is a hypernym of note value; that is, continuance is a word with a broader meaning than note value:

Other hypernyms of note value include duration.

note value (noun)	continuance (noun)
(music) the relative duration of a musical note	the act of continuing an activity without interruption
	the property of enduring or continuing in time
	the period of time during which something continues