Sorry Jerome
I didn't see your post before I entered mine.
They have the same info.

Bob1950

A 9 chord has a 7 in it. 1-3-5-b7-9 or maj9 = 1-3-5-7-9

or m9 = 1-b3-5-b7-9

A sus2 chord does not it's 1-2-5

A suspended chord suspends the 3rd usually a short chord.

Alan Parsons song Eye in the Sky uses the Dsus2 to D.
A first position D chord with an open 1st string.

A sus2 and a sus4 are the same chord with a different root.

Sus2 1-2-5 =C-D-G

Sus4 =1-4-5 = G-C-D

A Csus2 = G sus4

Bob1950