• Suede:
“Velvet-like nap finish produced on leather by abrasive action (buffing)”
“A generic term for leathers whose wearing surface has been finished to have a velvet-like nap.”
Suede is normally manufactured from split leather (see the definition of “Nubuck” below).
  • Nubuck:
"Cattle hide leather, buffed on the grain side to give a velvety surface.”
(Nubuck cannot be made from split leather:  it is grain leather that has been buffed on the grain side).