The G9 sus 4 chord (G9 suspended 4, or F/G) contains the notes G, C, D, F and A. It can be thought of as a G9 chord with a 4th (instead of a 3rd) or an F chord with a G in the bass.
10 Ways To Play The G9 Sus 4 chord
If you’ve come to this page just to view some chord diagrams for G9 Sus 4 (F/G), here they are.