Clef and Tenor clef

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

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

Tenor clef noun - A clef that puts middle C on the fourth line of the staff; used for writing music for bassoons or cellos or tenor horns.

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