This question stems from a recent discussion I had with a friend, neither of us are academically trained musicians. A chord was described as a Gm9/C. My point of view was that the C note makes it a Gm11/C. The opposing view was that since C was not an upper voice, it would be wrong to call it a Gm11/C.
For clarity, the notes from bottom to top are C G Bb D F A
I can see it both ways.
If someone had to play using chord symbols and could not use traditional notation, then writing Gm9/C on a page would help signal that the C is not included in the higher register. If I were trying to analyze a passage with all these notes then I would call it Gm11/C because I think it makes the function clearer (there is an 11 in this chord, the inversion makes it clear it is the bottom voice).
The context is within a jazzy approach to hip hop production. So the most modern naming convention is what I'm looking for.
(Ultimately, calling this a C13 or a C13(no3) is probably the best approach, but for the sake of discussion lets say that it is clearly functioning as some sort of Gm chord. Say as the ii in a ii-V-I)