acetaminophen = paracetamol = Tylenol

One compound*, different names.

…Pedantic edit ten days later that nobody will even read:

*plus fillers and binding agents which can vary substantially between manufacturers for many medications, but not the active ingredient(s)

Acetaminophen and paracetamol are the same thing.

Others have answered, but I’ll say it anyway.

The name paracetamol is used in most of the world, and by the WHO. Acetaminophen is the adopted name in the United States, Canada, and Japan. US pharmacies also use APAP. The most common trade names are Tylenol and Panadol. They all refer to the same stuff.