Is my understanding correct?

  1. Advertisement is more formal than ad.
  2. Advertising is a mass noun and advertisement is a count noun referring each piece of advertising.
  3. Commercials can only used in pl form to mean a special type of advertisement, the video format on TV.
  • Merriam-Webster online gives examples of the singular use of commercial to invalidate your point 3. Keep reading. Nov 11 at 14:16
  • But other than the possibility of commercial singular, yes correct Nov 11 at 20:31

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