I had to do some research, I knew such strong opinions had to have a basis in fact.
Chromatic is the use of notes foreign to the diatonic scale.

Accidental is a note foreign to a key by signature

Accidentals in the western system of scales within which all notes are assumed to be natural unless accidentals precede them ( accidentals meaning Flats, or Sharps ).

Dont bitch at me if theirs disagreement because these defs. came out of Britannica.
Thanks to everyone for helping me grasp these things.
Sorry to those I may have offended in the process.
But thats just me.