subtonic vs musical note

subtonic and musical note both are nouns.

Word	Noun	Adjective	Verb	Adverb
subtonic	Yes	No	No	No
musical note	Yes	No	No	No

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

subtonic: (music) the seventh note of the diatonic scale
musical note: a notation representing the pitch and duration of a musical sound

Other hypernyms of subtonic include note, tone.

subtonic (noun)	musical note (noun)
(music) the seventh note of the diatonic scale	a notation representing the pitch and duration of a musical sound