clef vs musical notation

clef and musical notation both are nouns.

Word	Noun	Adjective	Verb	Adverb
clef	Yes	No	No	No
musical notation	Yes	No	No	No

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

clef: a musical notation written on a staff indicating the pitch of the notes following it
musical notation: (music) notation used by musicians

clef (noun)	musical notation (noun)
a musical notation written on a staff indicating the pitch of the notes following it	(music) notation used by musicians