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canker sore vs. ulcer

canker sore

noun
  1. an ulceration of a mucous membrane, especially of the mouth.

ulcer

[ uhl-ser ]
noun
  1. a sore on the skin or a mucous membrane, accompanied by the disintegration of tissue, the formation of pus, etc.
  2. peptic ulcer.
  3. any chronically corrupting or disrupting condition, element, etc.