In light of some recent answers to questions I have asked on Stack Exchange with regards to naming chords, I have decided to refine things a little further, focusing on sus chords.
If a chord contains no 3rd, but does contain a second or fourth, then it can be considered a sus chord if the function of one of these extensions is to resolve to the 3rd of the chord. This makes a lot of sense, particularly when you consider the classical beginnings of the suspension (4-3, 9-8, 7-6).
However, I see examples of chords that contain the 7th and 4th, which have no intention of having their fourth note resolve down to the third, but are still considered sus chords. (A7 sus4 flat 9 being an example). Would this chord not be better described as some sort of A11 flat 9 for this reason? Otherwise, I am not really understanding what truly makes a chord a sus chord.