Clef and F clef

Clef noun - A musical notation written on a staff indicating the pitch of the notes following it.

F clef and clef are semantically related. In some cases you can replace phrase "F clef" with "Clef", this terms are similar.

F clef noun - A clef that puts the F below middle C on the fourth line of a staff.

Clef and F clef are semantically related. You can use "Clef" instead a noun phrase "F clef".