Root : C
4th : F
5th : G
Dominant 7th : A#
9th : D
C9sus4
Contains an F as the bass note.
Notated as C/F
C9sus4/F
Contains a G as the bass note.
Notated as C/G
C9sus4/G
Contains a D as the bass note.
Notated as C/D
C9sus4/D
A jazz sus chord or dominant 9sus4 chord is a seventh chord on the fifth scale degree of the key with a suspended fourth and an added ninth. Functionally, it can be written as V9sus4 or V7sus9.