Major 9 guitar chords can be replace major 7th chords replacing chords I and IV chords in major keys.
Major 9 guitar chords use these degrees of the major scale: 1, 3, 5, 7, 9
F major 9 uses these notes: F, A C, E, G
Our guitar chord uses the notes in this order: F, G, A, E
As you can see this inversion has no 5th (C), it's common to leave this note out.
Tune in tomorrow for another Guitar Chord Of The Day