Am7(9) = Am9 Chord on Guitar
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Major chords [chords based on a major triad]
CC(add9)C6C6/9Cmaj7Cmaj7(9)Cmaj7(13)Cmaj7(#11)Cmaj7(#5)C7C7(9)C7(13)C7(b9)C7(#9)C7(13,b9)C7(b13)C7(#5)C7(b9,b13)C7(#11)C7(b5)Minor chords [chords based on a minor triad]
CmCm6Cm6/9Cm(add9)Cm7Cm7(9)Cm7(11)Cm7(13)Cm7(b13)Cmmaj7Cm7(b5)Cm7(11,b5)Sus chords [3rd suspended and replaced by a 4th or 2nd]
Csus4Csus2C7sus4C7sus4(9)C7sus4(b9)C7sus4(13)Augmented chords [major chords with augmented 5th (#5) ]
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The minor 9th chord - m9 respectively m7(9) - is a minor 7th chord with an additional major 9th (9). You can get the 9 on the guitar fretboard, when you go up a whole-step (2 frets) from from A (1) to B (9). However, it will be written as 9 and not as 2, because it is a chord extension (the number 2 only occurs in sus2 chords).
The Am7(9) respectively A9 chord has the notes A (1), C (m3), E (5), G (7) and B (9). You can omit the 5th if you want.
Especially in jazz and latin music m9 chords are very common. Minor 9th chords can normally be played instead of a basic minor 7th chord, but you have to take care when it comes to the 3rd scale degree of a major scale, for example an Em7 in the key of C major. Here the next tone after E is an F (just a half-step away) and that is a b9. The b9 sounds just awful in a m7 chord and the 9 (F#) doesn't belong to the C major scale. Often a change of key is generated by adding a corresponding dominant 7th chord and voila! – the 9 works in that case, for example in the progression Em9 A13 Dm9 G13 Cmaj7.
must know
You should memorize these chords, if you are using this chord type frequently.
moveable
You can transpose these chord shapes to any different key just by moving the whole chord shape along the guitar fretboard until the squared spot represents the new root.
capodaster
The pleasant sound and sometimes easier playability of an open chord can be put into practice by mounting a capodaster on the indicated fret. Of course that may goe along with the disadvantage of not being able to use the frets lower than the capo anymore.