The G minor ninth chord is a 5-note chord consisting of the notes G, Bb, D, F and A.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as Gm9.
Chords that are a superset of Gm9. The chords include more notes but always G, Bb, D, F and A.
Chords that are a subset of Gm9. These contain less notes but all of them are included in Gm9.
In case you prefer a non-interactive variant of the chord chart, we've embedded a PNG image below that shows the notes for the the Gm9 chord. Feel free to save or share the image as needed.