I wish it was more clear. There are three main widely available OTC medications that broadly cover main categories such as pain reliever, fever reducer, etc:

Ibuprofen (known colloquially more commonly as Motrin or Advil in the US)

Acetaminophen (also known by chemical name paracetemol outside of the US and brand name Tylenol in US)

Acetylsalicylic acid (also known as Aspirin, was previously a trademark but now a generic name)

I always try to avoid using the brand names in favor of the actual chemical names to dodge ambiguity and confusion (there are other brand names for acetaminophen, acetylsalicylic acid, and ibuprofen over the ones I have listed even in the US), but even then in the case of acetaminophen it cannot be avoided. Further compounding (pun intended?) difficulty is trying to pronounce acetylsalicylic acid to the layman instead of just saying "Aspirin". In the US at least, you can get away with saying ibuprofen vs "Motrin" and acetaminophen vs "Tylenol", but the Aspirin problem is a bit more of a difficult hurdle to overcome in terms of layman's communication.

Slightly tangentially, when referring to airports I even have the same problem. I always try to go by IATA airport code, but those apparently have ambiguities as well: AUS is the IATA airport code for Austin-Bergstrom, but in ICAO terms it's actually known as KAUS, presumably to avoid conflict with other airports outside the US who might also answer to the callsign "AUS"